Mathematician Answers Geometry Questions From Twitter | Tech Support | WIRED

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Mathematician Jordan Ellenberg answers the internet's burning questions about geometry. How are new shapes still being discovered? Where are we using Pythagorean theorem in real life? How many holes are in a...straw? Ellenberg answers all these questions and much, much more!
Jordan Ellenberg's book Shape is available on Amazon or Penguin Random House
www.amazon.com/gp/product/198...
www.amazon.com/gp/product/198...
Director: Lisandro Perez-Rey
Director of Photography: Constantine Economides
Editor: Richard Trammell
Expert: Jordan Ellenberg
Line Producer: Joseph Buscemi
Associate Producer: Brandon White
Production Manager: D. Eric Martinez
Production Coordinator: Fernando Davila
Casting Producer: Nick Sawyer
Camera Operator: Christopher Eustache
Gaffer: Rebecca Van Der Meulen
Sound Mixer: Michael Guggino
Production Assistant: Sonia Butt
Post Production Supervisor: Alexa Deutsch
Post Production Coordinator: Ian Bryant
Supervising Editor: Doug Larsen
Additional Editor: Paul Tael
Assistant Editor: Billy Ward
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15 май 2024

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Комментарии : 1,3 тыс.

@Vaenivo 5 месяцев назад

I'm a fan of this series, but Jordan was a particularly strong communicator. Thank you for bringing him on, and thank you to Jordan for being a fantastic ambassador for geometry and math writ large.

@riesvanwijngaarden3417 5 месяцев назад

To be fair, he did miss the opportunity to proclaim that hexagons are the bestagons

@thatrandomharpguy7564 5 месяцев назад

thats my uncle lmao

@lucasm4299 2 месяца назад

Why did you use “but” as though you were going to say something bad?

@alan_davis Месяц назад

@lucasm4299 because they understand language better than you 😊. "But" can be used to contrast with (e.g. I'm a fan, but this was trash), or to add to (I'm a fan, but this was excellent).

@AustinJohnPlays 4 месяца назад

I have a use for the pythagorean theorem in real life application. I’m told a TV’s screen size always as side C and I know it is a 16:9 aspect ratio. I can find the height and width of that screen when the site doesn’t list the dimensions.

@chesterotontop 4 месяца назад

The only true use of the Pythagorean theorem

@runstarhomer2754 4 месяца назад

@@chesterotontop unless you're an engineer, architect, scientist, mathematician, programmer, city planner, game developer, digital artist, etc etc etc.

@estebanalcantara616 4 месяца назад

Didn't expect to see AustinJohnPlays here but cool to see!

@trinitrotolueneRBLX 4 месяца назад

@@runstarhomer2754 He’s being sarcastic

@darkfoxfurre 4 месяца назад

Well, you'll be able to find out the height and width of the LCD panel; but that screen size doesn't include the plastic frame around the LCD panel. So it can be useful for comparing monitors to one another, but not for knowing exactly whether or not the monitor/tv can fit in a given area. It wouldn't be a bad ballpark for it, though.

@hw7003 5 месяцев назад

As a quilter I use the Pythagorean theorem to figure out how many triangles I can get out of my fabric and how big to measure them. Once I had a pattern for a skirt that wanted right triangles of a certain length on the "c" side so I used it to calculate the "a" and "b" sides

@3snoW_ 5 месяцев назад

As someone who's played around trying to program a pool game, balls in the game have known X and Y coordinates, I've used the Pythagorean theorem to find the distance between balls to check when the balls hit each other.

@colinwood9717 5 месяцев назад

I once had to use the Pythagorean theorem as a web developer to calculate the size of a resizable widget when you clicked and dragged the corner! I was like "huh I guess knowing that actually was useful after all"

@ima.ekenes 5 месяцев назад

I came here to say I use the Pythagorean theorem for sewing too! For me it's to make zero waste flaired skirts. 💃🏻

@BrainBlaster11 5 месяцев назад

I use it for plastic wrap 😂 the wrap is normally always the c, so if you go all the way down to a, it will always be enough wrap

@CraigKostelecky 5 месяцев назад

Contractors can also use it to make sure a corner is actually 90 degrees. Measure 3 going one way, 4 going the other, and adjust the corner until the hypotenuse is 5.

@JoshBelville 5 месяцев назад

As a regular Dungeons & Dragons DM, I have sometimes used the Pythagorean theorem to calculate the distance of flying creatures moving diagonally to the ground to attack players. I'm just glad online calculators exist so I don't have to do the math myself. 🤣

@MagatsuNimura 5 месяцев назад

This is precisely the only way I've used the theorem in the last 25 years hahahahaha. And quite often, I must say.

@ccorvid 5 месяцев назад

saaame lol. til the dm reminds me that diagonals technically don't exist in dnd lol

@obiwanpez 5 месяцев назад

I created a Collatz Dungeon for a party that was testing the Constable's patience. They would get dropped in Room 3,505,346, and they would be connected to two others, one double the number, and the other half as much. Eventually, they would hit an odd-numbered room, n, which would connect to Room '3n + 1'. All numbers, eventually, will connect to Room 1, where the exit would be.

@plazma5343 3 месяца назад

Its very helpfull in vidéo games too ! I use it all the time to calculate distances between two objects in a plane in small personnal game projects :) Every object has x and y coordonnates, calculating the distance between the two is one of the most important things in a game. For détection, colisions etc... and Pythagore is always used.

@klausoshaunacey8429 5 месяцев назад

I highly recommend the essay “A Mathematician’s Lament” for anyone who wants to go deeply into the way we teach math and how poorly it’s taught that most students find math boring and frustrating in most math classes (I know mine classes were definitely not taught well). Jordan has the energy and love of mathematics that would make him an excellent teacher, and I wish I had someone like him while I was crying over my algebra 2 homework.

@Mark-wd5zb 5 месяцев назад

OMG THANK YOU SO MUCH FOR THIS RECOMMENDATION....One page in and I absolutely love this premise. It's so perfect.

@nessamillikan6247 4 месяца назад

I hated math in school with the exception of geometry in 10th grade. That was a blast. But algebra was always a nightmare. Then I signed up for an algebra class in college with a specific math teacher everyone recommended. She taught math on colorful handouts and in true layman’s terms to where it all connected and made sense. It was like learning math where every lesson is “explain to me like I’m 5”, and her method of teaching was extremely effective and fun! So many students needed a total refresh of some basic math concepts just because of how poorly they were taught in the public school system, and she helped so many students, including me, to be unafraid of math. I wish there were more teachers like her around.

@ClonedGamer001 5 месяцев назад

I think the issue with the "Does a straw have one hole or two?" question is that everyone treats it as a geometry problem when it's more of a language problem.

@jw4985 5 месяцев назад

Wittgenstein says hello!

@noomade 5 месяцев назад

there is no language problem. A straw clearly has one hole which ever way you look at it 😉

@eric8764 5 месяцев назад

I mean, more of a topology question than geometry.

@johnnythunders968 5 месяцев назад

I feel the same way about the question of “are we living in a simulation?”

@hugomondoloni9808 5 месяцев назад

Y it s a question of définition In maths (topology) the straw has one hole cause it s fondamental group is isomorphic to Z

@yaekmon 5 месяцев назад

The Pythagorean theorum has a lot of real world applications in architecture. For example, it's useful for designing staircases, since if you know the height of the upper floor, you can calculate the length of the staircase for any given footprint.

@FHL-Devils 5 месяцев назад

I used it recently to calculate the bill of materials on the roof of a shed I was building. Of all the mathematical / geometrical rules, this one is one of the more applicable ones to the real world... of course, if you google 'Trigonometry calculator', that's even more precise, and takes away the actual need to do the math...

@kingchickadee8694 5 месяцев назад

@@FHL-DevilsI did something similar to turn the old, flat, but too short driveway into a new, longer driveway that would have a steep slope. Needed to make sure the rise on the slope wouldn't scrape the car

@lourainevillalon3852 5 месяцев назад

i was able to use phytagorean theorem on how much we need to extend our roofing for us not to have side-hitting rain hit our wall (which can weaken the concrete overtime due to accumulation of moisture). i was actually surprised when the calculations worked!! i felt like a wizard

@kered13 5 месяцев назад

TV screens are all measured in the diagonal dimension. So if you have a space on your wall that is X inches wide, you can use the Pythagorean theorem (and the fact that most TVs have a 16:9 aspect ratio) to determine the largest screen size you can put there.

@matthewhale1572 4 месяца назад

I qm an engineer and i use it all the time

@rol1in0n20s 4 месяца назад

Honey combs is 100% a packing efficiency problem. If you take any circular object, beer bottle, golf ball, whatever. Any circle, and more circles of the same size. You can wrap 6 more circles around the original.

@kaseyrolow Месяц назад

That’s wrapping around to make another circle. So yea. But there’s still negative space that’s not being utilized. With strait lines you can take away that negative space. Hence Tetris etc.

@Majwt 5 месяцев назад

6:58 The A paper sizes (A4, A3 etc) have a similar property, but it uses sqrt(2) instead of the golden ratio. When you fold it in half the ratio between the long and short side remains sqrt(2).

@brianjackson2733 5 месяцев назад

I used to use Pythagoras to mark out an accurate filed when laying out our clubs field hockey lines at the start of each season. Mark the baseline and then use a 3,4,5 triangle to make 90 degree corners for each sideline.

@mm9773 5 месяцев назад

That’s the one. The Pythagorean theorem’s most useful real world application is to mark out exact right angles when the biggest square you have is still far too small: you can do it with a tape measure.

@marshallc6215 5 месяцев назад

6:10 if you pinch the bottom, it has zero holes. A bowl or a plate don't have a hole, and an open-topped bottle is the same shape as a bowl or a plate.

@theastuteangler Месяц назад

is a bottle a bowl?

@marshallc6215 Месяц назад

@@theastuteangler sure, seems a reasonable grouping

@robertalexander-bk5zj 4 месяца назад

As we all know, hexagons are the bestagons, but it was nice to hear an explanation about it being incidental in the case of hive cells. Never heard that before in explanations of the subject.

@SpitfiretheCat16 4 месяца назад

actually, triangles are the divine shape

@robertalexander-bk5zj 4 месяца назад

Don't make me call RCE. lol

@yxx_chris_xxy 2 месяца назад

Jordan gave a bad explanation here though. What is special about the regular hexagon is that among all regular polygons (i.e. whose sides are all the same length and the angles between adjacent sides are the same), it's the one with the most sides, such that you can fill a plane with them without gaps. So this uniquely satisfies the goals of maximizing the space for larvae with round cross-section, packing as many compartments into a given space, and minimizing material (wax) cost while having uniform wall strength. No other possible shape is as good as that. You can build a honeycomb out of regular triangles of squares and you'll fill the space with compartments and maintain uniform wall thickness, but it's a bad use of space because you need to make the triangle or squares rather big to fit the round-cross section larvae; if you take regular polygons with 7, 8, 9, or any large number of sides, you will leave unused gaps or waste wax.

@ilangated 5 месяцев назад

Pythagorean theorem is really handy for figuring out distances in D&D where all battles are on a grid

@anonymousaxolotl 5 месяцев назад

Nice one lol I'll be using that now

@stonedmountainunicorn9532 12 дней назад

This is like the sixth comment about D&D i'm reading, amazing

@jensraab2902 5 месяцев назад

I love how unapologetic Jordan is about drawing crappy circles! 😂 On a more serious note, I was impressed by how well you pronounce the German names (Einstein and Möbius) in such a casual manner.

@ClickBeetleTV 5 месяцев назад

The Pythagorean theorem is used constantly in data science as a measure of similarity between data points, like if you want to know which of your customers are most similar to each other.

@fallen3424 5 месяцев назад

yup, just usually in higher dimensions

@ClickBeetleTV 5 месяцев назад

@@fallen3424 I wonder if they shouldn't teach in school that you can have like a 17-dimensional Pythagorean theorem and it works just fine

@tmjz7327 5 месяцев назад

Not really, the pythagorean theorem is just a rearrangement of the distance between two points in Euclidean space.

@ClickBeetleTV 5 месяцев назад

@@tmjz7327 Which part of that do you believe is a contradiction

@junkmail2223 5 месяцев назад

that seems to be a pretty weird literalization of an abstraction and idk how well that holds up

@afonsoferreira5835 5 месяцев назад

5:04 There is one hole on the straw. When you cover the bottom, then the straw has no holes (a water bottle can be deformed into a bowl or a plate, for example)

@xraygamer9895 5 месяцев назад

What is the fundamental group of the straw?

@someguy1ification 5 месяцев назад

if you bend a straw too much, then it will have more holes and you won't be able to use it.

@redshift6668 5 месяцев назад

@@xraygamer9895Z. It's either homeomorphic to a solid torus (if you assume it has width) or a cylinder (assuming no width). Either case the fundamental group is Z. It could still have higher dimensional holes but the homology groups are of course all trivial except for dim 0 and 1.

@rohinkartik-narayan7535 5 месяцев назад

"[Geometry] is the only part of math where you're asked to prove something..." Number theorists: "Am I a joke to you?" *war flashbacks to Abstract Algebra* (To be clear, it's fun, but hard)

@d4rkgriff1n3 5 месяцев назад

I'm pretty sure that proofs are common in exercises and tests for any undergrad level math courses lol

@iamspeare 5 месяцев назад

As an Army Sniper I used to do a brief/lecture called "How the Pythagorean Theorem Saved My Life." We use it in ballistics.

@TheNaturalGamer1 3 месяца назад

Send me the power point cuh

@Rainbowkiddus Месяц назад

Yea aight

@the_koschi 5 месяцев назад

The straw answer was confusing. Topologically, the straw clearly has ONE hole, like a bagel. And a bottle has NO holes. Think about it: A bottle is basically just a deformed bowl, and a bowl is just a plate with an higher edge. A plate has no holes.

@keetonhersey2245 5 месяцев назад

There are people who view a straw, rather than as continuous surface, as a set of two spaces: an inside and an outside. The argument for a straw having two holes is that there are two clear connection points between the spaces, at the top and at the bottom. Depends on if you view the straw as a topographical surface or as a household object.

@cleverclover7 5 месяцев назад

wait you might be right

@averynicebean 5 месяцев назад

If you dig a hole in the ground, you would call it a hole. Does it go through the Earth? No, but we still call it a hole. Maybe we need better definitions of what is a hole that goes through an object vs a hole that is subtracted volume.

@bayleev7494 5 месяцев назад

@@keetonhersey2245perhaps more precisely, one can view a straw as a 2-manifold-with-boundary, and the boundary consists of two disjoint circles. those two circles constitute the holes of the straw. however, i do agree that it was confusingly worded; in his effort to avoid jargon, he ended up watering down the discussion and making it seem less certain than it is.

@the_koschi 5 месяцев назад

@@averynicebean I agree, a clear definition would help. The definition in everyday live is not rigorous. It will heavily depend on the actual shape of the subtracted volume, not the total amount, what we call a hole. No one looks at a valley and says "That's a hole!"

@fieryweasel 5 месяцев назад

When he mentioned the super hero movie not inventing the tesseract, I angry-scrolled to make sure "A Wrinkle in Time" was mentioned, just as he said it.

@EugeneEff 5 месяцев назад

I had to give this a watch. I just used the Pythagorean theorem about two minutes ago. Creating miters for a picture frame and I needs to determine what the third side is going to be!

@stephenmdalton 5 месяцев назад

A slight variant of the Pythagorean theorem is very useful in the real world: for a triangle, a^2+b^2=c^2 precisely when the angle opposite c is 90 degrees. This can be used, for example, when pouring house foundations, to ensure the corners are (very close to) right angles. It translates the accuracy of length measurements to accuracy of angle measurement.

@NandrewNordrew 5 месяцев назад

Thats exactly what the normal theorem is

@kalentober-hammell1896 5 месяцев назад

@@NandrewNordrew Usually I see Pythagorean Theorem presented as "For a right triangle: a^2 +b^2 = c^2", he seems to be saying "If a^2 + b^2 = c^2 then you know the angle opposite c is 90 degrees", which is a slight variation.

@riotpaladin9764 5 месяцев назад

I just watched a 17 minute video about math of all things, and was entirely entertained by the presenter. Incredible.

@some-math-nerd6805 5 месяцев назад

As a math teacher, this brings back memories of my college geometry and math history courses! Love it! It’s awesome to see somebody love their profession so much! 😊

@redredred8408 4 месяца назад

3.7111111111111111111111111111111

@jpacklick 5 месяцев назад

Fun fact: the four dimensional tesseract was the central plot feature of Robert Heinlein's short story 'And He Built a Crooked House' published in 1941, twenty one years before 'A Wrinkle in Time' came out. Though I loved a Wrinkle in Time, Heinlein did a far better job describing it.

@ccorvid 5 месяцев назад

I just finished Stranger in a Strange Land, and his description of Mike sending things Away was so good! I'll have to check out that short story sometime soon!

@yxx_chris_xxy 2 месяца назад

Agree. And this wasn't the only suboptimal description in this video.

@safariguy 5 месяцев назад

Love his enthusiasm for math and geometry!

@nomadicyears3978 5 месяцев назад

As someone who plays a lot of D&D we use the Pythagorean theorem all the time to figure out spell distances with flying creatures lol..

@14768 4 месяца назад

This dude needs his own RU-vid channel where he teaches math. So much more charismatic than any teacher I ever had.

@Kazutoification 4 месяца назад

One hole, two openings.

@friendlybello 5 месяцев назад

What's fun about this guy is he's clearly talking to the people in the room, not necessarily to the camera. Looks like they were eating it up.

@stevegonzalesjr6007 5 месяцев назад

I’ve never liked math but I love this man’s enthusiasm.

@salislazy 5 месяцев назад

wired messed up not giving this poor mathematician his chalk and board 😭 on a serious note, what delightful communication skills this guy has

@goldkomodo26 5 месяцев назад

"Imagine someone with no sense of purpose." Me: Of course I know him, he's me

@davidm2.johnston684 5 месяцев назад

On the Pythagorean theorem : when I was a little boy, on my usual path to school, I had to around two sides of a square, as to not walk on a bit of lawn. I wondered how much distance I would spare every day if I just crossed that lawn across a diagonal. Well... One day I learned how to get that answer. You just have to be curious and you will need math in your everyday life.

@hughjazz4936 5 месяцев назад

Took me almost 10min to realise I own on of this guys' books. "How not to be wrong". Great read.

@K_FI_L_Y_P_S_O 5 месяцев назад

Such a great episode. You should film a few more with this guy!

@NFITC1 4 месяца назад

The answer to the straw problem is it is no longer a straw if pinched and a bottle is no longer a bottle with a hole in the bottom. And thank you for mentioning honeycombs are actually circular when created. They settle into hexagonal shapes because of how tightly the bees pack them in and how flexible the material is initially.

@RikFTK 4 месяца назад

A straw with a pinched bottom has completely lost it's function. Is it still a straw if it can't do what a straw is supposed to do? At this point, it becomes a philosophical question. Another interesting question regarding this: of you hang up a spinning disk and the shadow of the disk is exactly under it, is the shadow also spinning or is it stationary?

@cariboubearmalachy1174 5 месяцев назад

The Pythagorean theorem is good for calculating straight distances on a map with grid lines. You count how many vertical and horizontal lines you're crossing and then use Pythagoras to calculate the distance.

@arothmanmusic 5 месяцев назад

I always had a much easier time with geometry than algebra. At least with geometry I could get a mental picture of what I was trying to do, whereas algebra was just letters on a piece of paper. Of course, I still didn't do very well in geometry because I wasn't that good with the mathematics portion, but at least I knew when I got the wrong answer even if I wasn't sure why!

@KittenOverlord 4 месяца назад

For me it was quite the opposite. In algebra I was always top of my class but then we moved on to geometry. I sucked at geometry because I don't have the "mental picture" that all the other kids claimed to have. When doing algebra I just had to look at the equation and I would be able to write the correct answer almost immediately. Geometry wasn't like that though.

@BruceCinema1337 5 месяцев назад

6:00 How many holes in a bottle? Topologically speaking there are 0 holes.

@victormanjarinsala2253 5 месяцев назад

Why hexagons? Why hexagons??? Well, because hexagon is the bestagon!

@RomanNumural9 5 месяцев назад

Math finance PhD student here, just a comment about the random walk question. The Bachelier model in finance is a terrible model for stock movements and this was known at the time they published their model. A better model nowadays is models of the form e^(X(t)) where X(t) is some stochastic process (see something like geometric Brownian motion, the vasicek model, or more exotic models like the Heston model or general jump diffusion models). I bring up this detail because people get really silly and paranoid with stocks and it's important to note that these modeling problems are remarkably complex and nuanced. They require much more than just a random walk to be useful.

@JustGetitDoneQuilts 5 месяцев назад

I'm a quilter. I use the Pythagorean theorem almost every day

@yxx_chris_xxy 2 месяца назад

You also are an expert on knot theory, which is much deeper math than the Pythagorean Theorem.

@MessinAbout80 5 месяцев назад

I’ve never heard anyone describe Euclid as “a guy who lived in North Africa” …

@Dasyati 5 месяцев назад

If you've ever been walking down the side of an empty street, and you jaywalked diagonally to the other side instead of going straight across and down because it made for less walking overall to your destination... guess what, you used the Pythagorean theorem

@vincevvn 5 месяцев назад

No you didn’t. You just walked across the street. You didn’t use any theorem at all.

@ttmfndng201 4 месяца назад

not really. you're just using the fact that the shortest distance between two points is a straight line (in euclidean space)

@Dasyati 4 месяца назад

@@ttmfndng201 phblttbtt Euclidean who? You'll never catch me using THAT daily :P

@Sunflowersarepretty 5 месяцев назад

The straw hole one is crazy. My answer was two holes tho. Also I wish I could understand shapes in a 4 dimension. It makes no sense to me.

@travelsandbooks 5 месяцев назад

If you imagine time as the fourth dimension that works to my brain. The cube exists now and in a second and in two seconds. You can kind of imagine it moving through time.

@laksitowp 5 месяцев назад

@@travelsandbooks I still don't understand it :(

@yinjohn23 5 месяцев назад

How I think about shapes in 4 dimensions is by thinking about shapes in 3 dimensions, and hoping that similar reasoning carry over.

@12thDecember 4 месяца назад

Loved this episode! I didn't take geometry in high school; Ellenberg's knowledge, insight and enthusiasm make me want to take an online course to see what I missed.

@lptotheskull 15 дней назад

6:35 I find it pretty funny that we call it the golden "ratio" despite the fact that it is, almost by definition, *irrational*.

@keatings50 5 месяцев назад

I've used the Pythagorean theorem when I framed a new deck. Measured off to ensure the layout of the build was square. 3-4-5 method is what's it's called on most jobsites.

@aqwaa3057 5 месяцев назад

Pretty sure he is the first non-german Person, that i've ever heard to pronounce the name "Einstein" 100% correctly. Neat!

@rebeccamcnutt5142 5 месяцев назад

"Ein-shtein"?

@yxx_chris_xxy 2 месяца назад

@@rebeccamcnutt5142 Yes.

@giantqtipz6577 5 месяцев назад

i love the arithmetic of holes. always learning something new everyday

@tarmo4435 4 месяца назад

There is one hole at regular straw. If other side is plugged then there are no holes since if you start cut the straw shorter you end up plane. Also you can tie a string throught the hole of regular straw, but not plugged one.

@drew3399 5 месяцев назад

This was really good he made geometry sound pretty dope

@violetsparklez1191 5 месяцев назад

Why do bees use hexagons? Because hexagons are bestagons

@RecklessFables 4 месяца назад

He really dodged that question but probably because it is a physics question, not a geometry question.

@stephengreenberg1806 5 месяцев назад

Literally started reading "How Not to Be Wrong- The Power of Mathematical Thinking" 2 days ago and this is the first thing that popped up when I Googled him. Highly recommend the book!

@Neptoid 5 месяцев назад

Awesome! He visited topics I have heard of before but named them so elegantly that I’ll never look upon them the same again!

@redredred8408 4 месяца назад

3.8111111111111111111111111111111

@BenjamintheTortoise 5 месяцев назад

This was a good one!! He's an excellent communicator and super engaging! Loved this ❤️😊

@redredred8408 4 месяца назад

3.4111111111111111111111111111111

@yxx_chris_xxy 2 месяца назад

@@redredred8408 pi-ish?

@vminhope3040 5 месяцев назад

When he said “imagine a person with no sense of purpose” I felt that

@TorQueMoD 2 месяца назад

I loved your straw answer! It shows that there are multiple ways to look at anything.

@AlexanderLepges 4 месяца назад

The straw has one hole by definition of topology. There is no wiggle room here. The bottle example is really interesting and if you used it right it would have proofed the point. The bottle has ZERO holes (when you remove the cap). It is the same if punch a "hole" in a baloon. what you get is a surface with STILL zero holes. The bottle can be put flat with the rim of the opening to become the OUTER edge of a disc. So when you punch a hole in the bottom of the bottle you add ONE hole - and this bottle has ONE hole - as the straw has. Fun side view: A trouser has TWO holes. If you remove the height of the trousers to "zero" you have the two holes of the legs and the upper part of the trousers become the outer edge of a disc. Topology is precise in these definitions. I recomend checking out Matt Parker on this topic.

@ttmfndng201 4 месяца назад

"by definition of topology" that's the problem. Even though when talking about topology a straw undeniably has 1 hole, people aren't usually talking about topology when talking about straws. for example, if you asked most people how many holes a bottle has, they would probably say one.

@SimeonDenk 2 месяца назад

Enlightening! Someone recently asked how many holes a T-shirt has, and I said 6. My reasoning was: 1 - neck to waist 2 - neck to left arm 3 - neck to right arm 4 - waist to left arm 5 - waist to right arm 6 - left arm to right arm Thus, the number of holes would be the number of openings (n): (n-1) + (n-2) ... + (n-n) But with your stretching out revelation, I can see that it is openings (n): n-1. A T-shirt has 3 holes.

@zoltanlukacs5059 5 месяцев назад

I live in eastern Europe, I had a friend over, and he asked how many inches big my new monitor is. I could not remember it, but then I remembered the Pythagorean theorem, and that 1 inch is roughly about 2.5 cm-s. So I took my measuring tape, measured the sides, did the quick math, and could tell him it's 27". Could I have just measured the distance across? Yes Would that have been fun? No

@xliquidflames 5 месяцев назад

During a debate with a debunker, a flat earther was asked, "If a triangle has sides 1, 1, and 1, what are its angles?" The flat earther said, "One what?"

@kvonation8852 5 месяцев назад

60° but I’m not understanding the joke or the ppint

@duckymomo7935 5 месяцев назад

@@kvonation8852the triangle cannot exist in Euclidean geometry (flat surface)

@metallsnubben 5 месяцев назад

@@duckymomo7935 I mean it's just an equilateral triangle?

@tommyakesson8858 5 месяцев назад

We have an outdoor hot tub. I had to calculate how much cholrine to add. And thus needed its volume in liters (or dm3). First time I ever had to bust out pi IRL, and I only needed to wait till I turned 40!

@BeardedNerdSE 5 месяцев назад

Pythagoras is very handy for figuring out neat ways to build Lego in an interesting angle and still keep to the required strict dimensons of a piece. The recent Tranquil Garden set uses this to place the supports of a building five studs apart.

@MartyD 5 месяцев назад

hated doing geometry proofs in high school 😅😢😂

@arablues4142 4 месяца назад

A straw has 0 holes, its just a warped plane

@internetcutie Месяц назад

a warped plane that formed a hole by definition

@easymoneysniper9013 Месяц назад

The dictionary says a hole is a small and unpleasant place 😂😂

@arablues4142 Месяц назад

@@easymoneysniper9013 🤣🤣🤣

@easymoneysniper9013 Месяц назад

@@arablues4142 so a straw IS a hole 😂😂

@MrBLAAHHHHHHHHHHH 2 месяца назад

The Arithmetic of Holes sounds like something Lisa Ann would star in.

@dethbucketghostparanormalg5042 Месяц назад

5:24 the straw theory makes my brain short circuit!!

@kingarth0r 5 месяцев назад

Jordan is type of guy to make easy exams and hard homeworks

@acustomer7216 5 месяцев назад

Yay geometry!! The only math class that made sense to me!!

@m.moonsie 5 месяцев назад

How about differential equations???

@bradypostma3708 4 месяца назад

The discovery of the hat and the specter - the aperiodic monotile (and its reflection) - is a great example of a newly discovered shape.

@volbla 4 месяца назад

Matt Parker (yt: Stand-up Maths) explained the honeycombs as simply the result of the bees pushing out all the walls when they build them. Circles don't tile the plane, but if you stack a bunch of circles and then expand them to fill all the empty space you end up with a hexagonal tiling.

@avaraportti1873 5 месяцев назад

To be clear, self-similar objects are merely a subset of fractals

@Troph2 5 месяцев назад

Finding 90 using 3,4,5.

@user-ky9qn4pg3w 5 месяцев назад

i've used pythagorean irl by trying to figure out my monitor size and having a ruler too short to measure the diagonal. I've used pythagoeran irl to figure out how much i need to move in diagonal to maintain same speed when coding video games. i've used area of circle/cylinder volume formula to find our the volume of the pots i have in the kitchen to see if they'll accomodate the recipes.

@NFSHeld 2 месяца назад

A use for the pythagorean theorem is finding out whether or not a glass dish on Amazon will be able to rotate in your microwave. The glass dish is offered in three sizes; S = 20×13cm (7.9×5.1"), M = 22×15cm (8.7×5.9"), or L = 24x17cm (9.4×6.7"). Your microwave's spinning plate has a diameter of 27cm (10.6"). You can calculate the diagonals of the dish sizes are 23.9cm (9.4"), 26.6cm (10.5"), and 29.4cm (11.6"). So you can safely purchase the S or M sizes, they should fit and spin just fine when properly centered, while the L dish will fit but is a bit too large to spin and gets stuck.

@sho3782 5 месяцев назад

I swear this guy sounds like Khan Academy

@ingGS 5 месяцев назад

You cannot come up with a use of the Pythagorean Theorem? Clearly you are not an Engineer. I use it daily in most of my designs.

@Astyl_ 5 месяцев назад

Well he isn't an engineer lol, he's a mathematician, we use triangles a lot in nautical engineering and it definitely comes up, but the question was more so for the everyday person.

@reinhardtdragomir6858 5 месяцев назад

well yeah mathematicians deal with more complex stuff than just pythagorean theorem, they come up with the formulas you engineers use

@ingGS 5 месяцев назад

@@Astyl_ Still it would be useful if he’s a teacher to provide a practical application to it, I know that as a professor real-world examples are better than abstract ones.

@Astyl_ 5 месяцев назад

@@ingGS I agree with that for sure.

@BigOttomatic 2 месяца назад

New application for Pascal's triangle learned. Cool. Only one I knew was coefficients for binomial exponential expansion

@xraygamer9895 5 месяцев назад

I always think of geometry as the study of spaces that have so much structure that they are interesting both analytically and algebraically(in that for instance, they have an inner product)

@izayus11 5 месяцев назад

This guy may know his math. He may be a genius at that. But he is truly awful at being a math communicator. Not only is he heavily biased to a branch of math applications, he is painfully unimaginative. The first question he answered is very euro-Plato-logo centric. It totally misses the richness other cultures, other philosophies, other paradigms and systems, other creative interpretations bring to math. Do you think the pitagoras theorem is only used to measure distances?! That is like saying that the number 4 was only invented to count apples. My dude, measuring distances may be less than 0.1% of the use of the pitagoras theorem. Vectorial analysis is a an invetion that transformed the world. Newton mechanics would be incredibly impractical without the PT. Electricity cannot be understood without the PT.

@Lavendercandle 5 месяцев назад

Wow

@ANunes06 5 месяцев назад

Arithmetic - Here's a number line Algebra - The formal logical rules and language of math Geometry - Can you draw it in some logical way and then deconstruct that drawing into an algebraic expression? Trigonometry - Geometry is cool, but we're going to spend a year talking about just Triangles but secretly it's about Circles. Calculus - Turns out rates of change are related to measured values are related to total accumulation is related to rates of change. Hope you really learned that Trig stuff. Linear Algebra - Box of Numbers Means Everything Differential Equations - How well did you understand Calculus? Statistics - Look at this bell curve for a full semester Set Theory - You will understand Set Theory so well that it will hinder your understanding of everything else forever. Real Analysis - Nobody really knows

@figpicker 5 месяцев назад

I'm always ready to learn more about the arithmetic of holes.

@crazyengineer101 5 месяцев назад

Awesome video! We need a part two!

@Ninjaeule97 5 месяцев назад

Pythagoras' theorem is incredibly useful when you are trying to make right-angle triangles. Since you generally want a house to have walls at right angles to each other, you can achieve that by just building a decently sized triangle that you can place into the corners. Apparently, not every mason knows this considering the ones that built our house screwed up and built the wall of angle to each other.

@redredred8408 4 месяца назад

3.6444444444444444444444444444444

@nathnolt 5 месяцев назад

Matt marker made a video on the reason why bees make hexagon patterns, it's called "Why Do Bees Make Rhombic Dodecahedrons" it's a good watch.

@GatherYeRosebudsWhileYeMay 2 месяца назад

3:29 the absolute mathematician sheldonesque sarcasm makes it for me ❤

@BobKimball 3 месяца назад

That was the most clear and succinct explanation of gerrymandering I have ever heard. Incredible

@JordonPatrickMears11211988 5 месяцев назад

I used Pythagoras in the army. It made going through bncoc incredibly easy because i didnt have to manually gind the distance between points. I had it exact everytime.

@RaDeus87 Месяц назад

I'm still proud of the time I used the Pythagoran theorem to drill a hole through a wall, it was for a fiberoptics duct. My co-worker just said sure go ahead, thinking it was just a waste of time. So I did my measurements of the wall (thickness and drop to the target), did the math and marked of a point on drill (the drill was the hypotenuse) and then used a ruler to measure the distance of that point to the wall so that I got the right angle. The triangle that I created with the drill and ruler was a smaller version of the triangle that the desired path was taking through the wall. I nailed the target exactly, my co-worker just looked at me and said that we'll be using my method going forward 😅

@lokii3635 2 дня назад

The Pythagorean therom is what carpenters use to keep your door straight and square, it's what's used to make sure ur walls are straight and square too. I use it alot when building something. Built a planter bed and used it, etc and etc

@rjharrold2907 5 месяцев назад

Cool video, happy to see someone else also appreciates how pringles are shaped so cool

@suzannehawkins383 5 месяцев назад

I've known the pythagorean theorem since I was a small kid in the sixties. my mom made me watch old movies with her. We watched "Merry Andrew', a musical starring Danny Kaye as a school teacher who teaches his boys math, and the Pythagorean Theorem through a musical skit. it's repeated several times in the skit. best into to maths ever!!

@redredred8408 4 месяца назад

3.6555555555555555555555555555555

@Fitzrovialitter 5 месяцев назад

5:52 You are changing the goalposts. If you pinch the bottom of the straw, it is no longer the straw as we understand it to be in your question, or what we commonly recognize to be a straw.

@redredred8408 4 месяца назад

3.3333333333333333333333333333333

@JayTemple 5 месяцев назад

10:56 I have to take issue with your statement that geometry is the only part of math where you're asked to prove things. It's certainly the first time most students are asked to do it, and it might be the only time it's required below an upper-class level college course, but higher algebra courses and even calculus classes have them.

@rileydunnaway2277 5 месяцев назад

Came here to say this

@Zzyzzyzzs Месяц назад

Pythagoras's theorem manifests most simply in how we navigate. You can see it in action when you have a block that's an open field and most people, rather than walking two sides of the block, cut diagonally across it to meet the other side, because we intuitively know that is a shorter distance. And if you extrapolate that in wider space, what you realise is that we intuitively recognise that walking a series of hypotenuses (i.e. radial lines plotted against imaginary right angles) is actually the most efficient way to navigate, which is why, as much as rectangular city blocks seem like the most efficient use of space for building, neat squares and right angles are actually very unnatural to us and a radial city plan is the most efficient for travel.

@jeschinstad Месяц назад

My grandfather did the straw thing to me as a child, I was eight or nine, I think. We drove through a long tunnel and he asked me how many entrances it had. I of course said duh, of course it has two. Later we stopped at a road stop and he looked at me through a straw and asked how many holes it had. I of course said one. He didn't explain anything, just waited for me to ask. I've never forgotten it. But i think it really opened my mind to the fact that language is one thing and reality is another. It's really important.

@akimmel6941 22 дня назад

In construction, we use the pythagorean theorem to confirm that our corners are right angles. If you measure out 3 [unit] on one side and 4 [unit] on the other, it should be 5 [unit] in a straight line connecting those points.