Euler’s Pi Prime Product and Riemann’s Zeta Function

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What has pi to do with the prime numbers, how can you calculate pi from the licence plate numbers you encounter on your way to work, and what does all this have to do with Riemann's zeta function and the most important unsolved problem in math? Well, Euler knew most of the answers, long before Riemann was born.
I got this week's pi t-shirt from here: shirt.woot.com/offers/beautif...
As usual thank you very much to Marty and Danil for their feedback on an earlier version of this video and Michael (Franklin) for his help with recording this video..
Here are a few interesting references to check out if you can handle more maths: J.E. Nymann, On the probability that k positive integers are relatively prime, Journal of number theory 4, 469--473 (1972) www.sciencedirect.com/science/... (contains a link to a pdf file of the article).
Enjoy :)

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7 сен 2017

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Комментарии : 658

@Kabitu1 6 лет назад

"Euler pushed that infinite sum to the limit.." You deserve a beating for that joke.

@koenth2359 6 лет назад

Even better, he said 'to the absolute limit' to make it more complex. Is that good enough for a total beat-up?

@christopherellis2663 5 лет назад

From the Inner Mind, to the Outer Limits!

@tejnadkarni131 4 года назад

That was a Parker Square of a joke

@davutsauze8319 3 года назад

@@tejnadkarni131 Ah, I feel like you're a traitor, even though I do like Numberphile too

@jameshoffman552 3 года назад

This channel and 3Blue1Brown have fantastic visuals that are very helpful. Both also have excellent, clear presentation. No other mathematics channel I've found come close to your skill in communication, which obviously involves a great deal of work to create all the graphis.

@xarmanhsh2981 8 месяцев назад

Best channels for insomnia so relaxing

@bigmouthfisheyes 7 месяцев назад

The expressions 6n +/- 1 produce all prime numbers greater than three, and many more composite numbers. If we knew exactly where the composite numbers would appear in these sequences, we could infer the location of all of the prime numbers. Am I understanding this correctly? Of what use would this be to anyone?

@naomioverton7893 4 года назад

My mind is so blown that I might cry a little later at the indescribable beauty of what I just learned. Thank you for existing Mr. Mathologer.

@aaronleperspicace1704 4 года назад

"Take the differences between 1 and the square of reciprocal of every prime number. Multiply them out to each other and take the reciprocal of this product. Multiply this reciprocal by 6 and square root the result. The value thus obtained is the ratio of the distance all around a circle to the distance across it".

@hybmnzz2658 3 года назад

@@aaronleperspicace1704 something interesting about this is how mystical pi seems when it is classically defined in terms of circles. No wonder hardcore analysts think of pi as defined based on infinite series and do not appeal to geometry.

@MrQwefty 6 лет назад

Mate, your pressentation is STELLAR! Seriously, the transitions, coloring, everything! Great job :D

@giladzxc17 6 лет назад

I love how this shows yet another intuitive explanation on 1is neither a prime nor a non-prime.

@viharsarok 2 года назад

By all means it's a non-prime.

@PC_Simo Год назад

@@viharsarok So, it has other factors, beside itself and 1 (which is itself)? I’d like to know more about these mysterious factors. 🤔

@KazimirQ7G 6 лет назад

I liked this format... with you floating around the equations. Much better than you presenting into a board, or scaring me with sudden sound effects. Keep it up!

@calma5869 4 года назад

I was deeply astonished by Euler's geniusity!! Thank you for introducing his research to me

@PrincessEev 6 лет назад

This might be my favorite video of yours yet. So much amazing information - especially how the prime product connects to the zeta function. That has always confused me - and I was probably too lazy to look it up - but that it's so simple is just ..beautiful in a weird way. XD

@davutsauze8319 3 года назад

"especially how the prime product connects to the zeta function. That has always confused me - and I was probably too lazy to look it up - but that it's so simple is just ..beautiful in a weird way." Ah, me too, I'm glad that I understand it now

@reggyreptinall9598 2 года назад

I solved the Riemann Zeta function! I posted the solution, check it out!

@reggyreptinall9598 2 года назад

I solved and proved the Riemann Zeta function. I just posted the solution check it out!

@darklink1113 4 года назад

Your graphics make these lectures. I foresee a time when all math is taught like this. I can't follow half of it, but I can at least follow. Thanks for these

@enzogiannotta 6 лет назад

You are my favourite math channel. I learn a lot from your videos!!!

@MrWkuling 6 лет назад

Thank you... beautiful video, your explanations demonstrate deep understanding and passion at the same time!

@abdullahalmosalami2373 4 года назад

12:00 Woah!! That was awesome!!! I just finished taking my Random Processes course as an Electrical Engineer last semester, and I'm so glad I watched this video after having taken that, cuz that was brilliant!

@pro4skill 3 года назад

Please tell me how it was relevant! I'm doing math and physics research

@richardschreier3866 6 лет назад

Thanks for another fun video! It is great that you still make the time to do this work even though the crush of the school term is once again upon you. Looking forward to more fun with zeta in the next instalment!

@Mathologer 6 лет назад

If only I had a bit more time. It would be great to be able to make more of these videos :)

@christophersewell6611 6 лет назад

Awesome video! This channel is probably my favourite math subscription :)

@yash96819 4 года назад

Great video, amazing explanation of how Euler arrived at that form involving just primes.

@rudilapa6569 6 лет назад

Professor, these are perfectly paced. They don't go so fast that I lose the chain, but never so slow that it becomes unexciting. It's high level, so there's room for mulling over what's needed to ground the proof. There's always hints of ways to take it further. And the use of the animated background blackboard to do the steps while you explain the ideas keeps it flowing. If you offered this type of freewheeling 'class' at your university it would be packed. And PI is related to the primes?! This is at least as amazing as e^(i*π).

@Mathologer 6 лет назад

Glad these videos work for you exactly as planned, and thank you very much for saying so :)

@rustyshackleford1964 3 года назад

Probably my favorite video! Thank you mathologer!

@FaissalChahrour 6 лет назад

many thanks for this video. it's the first tim i find the Euler's formula so beautiful and could really understand them

@xdingo93x 6 лет назад

Fiiiinally, now I understand how all the prime numbers got in there! Thanks for this video :)

@joelhaggis5054 6 лет назад

I love the Euler product formula. Glad you did a video on it.

@maurolocatelli3321 6 лет назад

14:00 with the primes < 1.000.000 you get 3.14159254713, 6 decimals correct! (Used Python...)

@davidherrera8432 6 лет назад

Beautiful, I'm seeing stars and little numbers arround my head, this is the stuff that make me love math!

@anitamathur2695 4 года назад

David Herrera Loma?

@deathlord109 6 лет назад

I really appreciate your effort in doing these videos :)

@valor36az 2 года назад

Amazing explanation I have been trying to understand this forever

@yairalkon4944 6 лет назад

An absolutely great video. Keep up the amazing job!

@balern4 4 года назад

I have watched many of your videos and I think this was the best one.

@-fitzy-3335 6 лет назад

Really great video man, keep it up :)

@erikcools891 6 лет назад

brilliant video, as always. Keep up the good work.

@koenth2359 6 лет назад

I think 32 years ago I was playing about with numbers and I discovered this relation between the prime product and the integer power sum (for real s>1) from a sort of sieve argument. I did not know this was a known result, nor had I ever heard of the Euler prime product or the Riemann Zeta function, but thought it was an interesting result. It was in the days before you could just google things. My father persuaded me to hand over my scriblings, so he could show it to a friended mathematician. Of course I got it back with the flaws in my 'proof' pointed out, without any hint that the result was known. My intuition was right, but I had no idea what a proof required.

@javierrivera7685 6 лет назад

Awesome video, very instructive and clear. I specially liked the probability connection of the zeta function

@Mathologer 6 лет назад

Glad you like it :)

@mrsebakuna 6 лет назад

beautiful story like always, love your presentation. strong logic and very valuable historical facts.

@abdeljalilpr2033 6 лет назад

Salamo aalaikom..you are posing a very important maths issues ..i want to say that resect you and you have to continue ..respect from morocco

@SimonFrank369 Год назад

IMHO your math videos are some of the greatest to be found on RU-vid!! Thx a lot for your work, Mathologer! And how come you speak German that perfectly!??

@maciejkozowski6063 6 лет назад

one of the best youtube chanel about math

@1DR31N 4 года назад

Nice and neat explanation. I would have wished to have a Math teacher like you when I was at school.

@pyrrho314 6 лет назад

your channel and videos are awesome, thanks!

@Mathologer 6 лет назад

Greetings from beautiful New Zealand. If you happen to be in Auckland today as part of the Maths craft festival I'll be giving a talk about the best ways to lace your shoes at the Auckland Museum at 5.15 p.m. Come and say hello :) www.canterbury.ac.nz/news/2017/maths-craft-festival-2017-hits-auckland.html As usual if you'd like to support the channel please consider contributing subtitles in your native language.

@JTX8000 6 лет назад

Welcome to Nz, hope you have an enjoyable stay

@JRush374 6 лет назад

Please do some videos on fractional calculus!

@Mathologer 6 лет назад

+Josh I'll put this topic on my list of things to ponder :)

@michaels4340 6 лет назад

Mathologer I'm not sure whether your proof (with conclusion at 5:16) is complete. Is that really a contradiction? Even if one function is bounded above by another, couldn't they still converge to the same value, as long as the difference between the sums converges to 0?

@AnarchoAmericium 6 лет назад

You should consider doing a video taking infinite products to infinite fractions (which is again due to Euler), especially condiering you already have videos on infinite fractions you can reference.

@mattdarcy6891 6 лет назад

unreal video keep it up man i love this

@zubmit700 6 лет назад

Best math channel!

@jennyone8829 Год назад

Thank you for existing 🎈

@PhilipBlignaut 6 лет назад

Just love your videos!

@rhc-weinkontore.k.7118 Год назад

Toll erklärt und sehr instruktiv. Ich danke dafür!

@eliesimsch3491 6 лет назад

Hi Mr. Mathologer(for lack of a better name), while I was doing my math homework today, I remembered a problem my math teacher gave me and my friend in 5th grade after we'd finished the work a little early. The problem was as follows: the king's daughter is to be married, and to choose the prince, the king has decided to seat the knights around a very big round table. Then he will start at the first knight, and say "you live." To the second knight, he says "you die." The last surviving knight is the one who wins. The challenge was to make a formula so that you could find which seat you wanted to sit at, to live(given between 1 and infinite knights). I made a little progress, finding that (obviously) even seats are bad, and that the good seat starts at 1, then counts up odd numbers to 2 higher than before, then resets to zero, but I only had a little time and I'm not good at math. In retrospect, I don't think I've heard of any similar problems, which is why I still find it curious.

@Mathologer 6 лет назад

+Elie Simsch This problem is called the Josephus problem :)

@martinullrich655 6 месяцев назад

Thanks a lot for this wonderful lesson!

@satyanarayanmohanty3415 4 года назад

You are amazing sir.

@obsoquasi 6 лет назад

very nice presentation. This is how math should be taught! Herzlichen Dank!

@Mar184 6 лет назад

8:02 wow, that pronunciation was perfect - well done!

6 лет назад

This is so satisfying!

@AltonMoore 4 года назад

This is a really good channel.

@silasrodrigues1446 5 лет назад

For this, you've just got another subscriber!

@tutordave 5 лет назад

Very informative. Thanks!

@jweezy101491 6 лет назад

This was a really great video.

@xyz.ijk. 4 года назад

This is even better the second time around.

@nezihokur 6 лет назад

I watch your videos with a lot of wow!s. Great fun!

@Mathologer 6 лет назад

Great, looks like "mission accomplished" as far as you are concerned :)

@travelion5359 6 лет назад

title seen - and already hyped

@Hythloday71 6 лет назад

AWESOME insights ! Expanded my knowledge / understanding INFINITELY ?

@jimjackson4256 3 года назад

It is about time I subscribe .

@AngryArmadillo 6 лет назад

Fantastic video!

@billbill1235 2 года назад

You should do a full video on the reimann heipothesis

@Meine_Rede Год назад

Hello Mathologer, thanks you so much for your video, which is the most impressive one I have seen in regards to the relation between Euler's Pi Prime Product and the Riemann Function. Just one small remark: I think on 6:21 it should say 1/27^z + ... and not 1/28^z + ... as stated in the video, simply because 3*9 = 27.

@aaronr.9644 6 лет назад

Awesome video!

@gerardomoscatelli8584 4 года назад

Hello there, great video. I used a fast function I found using a boolean sieve to list primes in Python and listed primes up to n=1,000,000,000. There are 50,847,534 primes and the last one is 999,999,937. Using this list estimated pi with Euler product at 3.1415926536126695 accurate up to the 9th decimal. Can't find more than up to n=1,000,000,000 prime, memory error. It would be interesting to graph how the accuracy of pi evolves with the number of primes.

@sarojsi890 5 лет назад

mind blowing excellent sir keep it up

@pronounjow 6 лет назад

Looking forward to the next video! I think I'm finally starting to understand the Riemann Zeta Function!

@dlevi67 6 лет назад

Wait until it becomes complex... (or rather, its argument becomes a complex number)

@hamidkh5488 3 года назад

Thank you very much .

@diegomontalvo9173 6 лет назад

Great video!

@SquirrelASMR 2 года назад

That was really cool

@jacksonstarky8288 Год назад

The number of views of this video compared with, say, the number of views of your Harmonic Series/Gamma video suggests to me that this video is criminally underviewed... which might be why it seems like we're still waiting for that Riemann follow-up video you talked about at the end. I would love to see something like what you hint at, explaining the connection between the Riemann zeta function and the Euler gamma constant.

@oneofmant 6 лет назад

amazing video!

@forestpepper3621 5 лет назад

Comment on 10:45 in video. The concept of a "random integer" is tricky. When you say, "choose one of these items randomly", if there are N items, then usually each item is chosen with probability 1/N. However, the word "randomly" assumes that you have defined a probability function on the items. 1/N is the the "uniform" probability function, but a different probability function would make it more likely to select certain items than others. *PROBLEM*: The integers can not be assigned a uniform probability function, with all integers equally likely, because there are infinitely many. The sum of the probabilities assigned to all items must equal 1, and if all integers had the same probability, these probabilities would sum to infinity. So, in choosing an integer "randomly", you must specify which probability function has been defined on the integers. There is an unlimited variety of probability functions that may be defined on the integers.

@alexandersanchez9138 6 лет назад

10:20 The killer instinct. Mathologer isn't afraid to strike at the heart.

@vikaskaushik8171 6 лет назад

Ultimate beauty of maths ......

@zhibinren1904 Год назад

This is amazing

@sylviaelse5086 2 года назад

When z = 1, the manipulations required to get the prime product result require multiplying infinity by integers, and then subtracting one infinity from another, and finally dividing one by zero, just for good measure. The conclusion at around 9:27 that there are infinitely many prime numbers is certainly correct, because we know that to be true, but I'm not comfortable that reasoning there is valid.

@holyshit922 4 месяца назад

13:16 To approximate pi i used Euler's formula for acceleration of series convergence to the arctan(1) After acceleration each iteration sets one bit of approximation (10 iterations gives three correct digits)

@IllumTheMessage 6 лет назад

Beautiful

@Patapom3 6 лет назад

Love you!

@yiliang2813 2 года назад

Amazing!!!

@Achill101 3 года назад

I've been writing questions in my comments so far, but I want to say also Thank you, Thank, Thank you, for your videos. It's a delight to watch them, especially this one. I hadn't heard it before, because I'm interested in geometry and calculus, not in primes, but I must admit this is a beauty. Now, to my question - sorry I can't let it be ;-) I would be grateful for an answer by everyone, of course, not only by Burkhard. @12:13 - it was said: "at least two of the ingredients of this proof need a little bit more justification and, well, can you tell which?" I cannot tell it now. Could anybody tell me, please, which two ingredients that could be?

@Achill101 3 года назад

I like this video a lot. At @9:46 the video seems a bit unclear of what is required to show for a second time that there are infinitely many primes, using equation: pi^2 / 6 = 1 / ( (1 - 1 / 2^2) * (1 - 1 / 2^3) * (1 - 1 / 5^2) * (1 - 1 / 7^2) * ... * (1 - 1 / prime(max)^2) ) with an assumed maximum prime number, prime(max). On the right side is a rational number, and it would follow that pi^2 is rational. But that pi^2 is irrational is a stronger statement than pi being irrational, like the square root of 2 is irrational, but its square, 2, is rational. Therefore, it's not enough to show that pi is irrational, which is difficult enough, but we would have to show that pi^2 is irrational for showing that there are infinitely many prime numbers. I personally find the proof using zeta(1) more beautiful.

@jimcarroll779 6 лет назад

Thank you

@dylanmelvin5206 6 лет назад

Thanks

@dushyanthabandarapalipana5492 3 года назад

Thanks !

@buddhirajabuddhiraja6319 3 года назад

Love it.

@isaacdesantigoisaac1319 6 лет назад

Best math viedeo ever

@saahilmehta 3 года назад

I remember our math teacher gave this to us in a probability question(Find the probability that 2 randomly chosen natural numbers are coprimes). The answer is 6 by pi square

@weidox Год назад

Great. Only that I'm unable to find the next video which was advertised at the end.

@claudiodeluca2357 3 года назад

Beautifull!!!

@SmileyMPV 6 лет назад

Since you're a mathematician and you like Rubik's cubes, have you ever looked into the fewest moves challenge? You have one hour to come up with a solution to a scramble, and the goal is to use as few moves as you can. I recently started to look into this, and there are some wonderful mathematics that have helped people achieve averages of less than 30 moves! There is some really interesting group theory involved. There is a technique called insertions, which uses commutators and conjugates. But the most interesting thing I have yet found is NISS, which is also based on group theory.

@Mathologer 6 лет назад

I looked at this a while ago, but from your comment it would seem that there have been some new developments. Do you know of some good references? I should really do another Rubik's cubed video sometime soon .... :)

@SmileyMPV 6 лет назад

Well I learned most things from this video series on youtube: ru-vid.com/group/PL0yL0AZiHw10Kx5um2l4MdOAICtRqJwac But this video series only explains how to apply some techniques. I came up with explanations for the techniques myself and you probably could too, but I later found this pdf: fmcsolves.cubing.net/fmc_tutorial_ENG.pdf This pdf goes more in-depth and has some explanations for the techniques it discusses as well. It also describes even some techniques not discussed in the video series. I do think the video series is still very good and will probably help more with visualizing than the pdf, even if the pdf has pictures and you can follow what the pdf is talking about by applying examples to one of your own Rubik's cubes. But I also recommend reading the pdf, even if it is pretty long, because this stuff is pretty interesting.

@tim1878 5 лет назад

Good job.

@nowhereman8564 3 года назад

Riemann what a genius was involved in general relativity and prime numbers

@samuraimath1864 6 лет назад

9:37 Even Euler "saw" that one coming :D

@zixuan1630 4 года назад

I really hoped that you could prove the Riemann Hypothesis.....

@marekvlasak4648 4 года назад

😂 No, its ur chance bro.

@vadimkhudiakov526 4 года назад

5:30, if there is strict inequality between 2 sequences a_n < b_n, it implies only non-strict inequality between limits lim a_n

@sergey1519 4 года назад

It doesnt? Assume your statement is true, then: A = 1/1 + 1/3 + 1/5 +... B = 1/2 + 1/4 + 1/6 +... Let C= 1/3 + 1/5+... D = 1/4 + 1/6 +... By your statement C>=D. A -1/1 = C B -1/2= D A - 1/1 >= B - 1/2 A >= B + 1/2 A > B