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An arithmetic-geometric limit 

Michael Penn
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18 сен 2024

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Комментарии : 34   
@MathFromAlphaToOmega
@MathFromAlphaToOmega 11 месяцев назад
As an interesting consequence, this shows that e^t ≥ t+1 from the AM-GM inequality, with equality if and only if t=0.
@complexquestion3601
@complexquestion3601 11 месяцев назад
There's a solution that's fairly simpler. The GM can be rewritten as (n!)^(t/n). Use Stirling's formula for n!, and because of the t/n exponent almost all factors have a limit of 1, and you're left with an asymptotic equivalent of (n/e)^t for the GM. Next, plug this equivalent into the GM/AM quotient, which is now (n^t / e^t )* (n/(sum of i^t from 1 to n)). Then divide both the numerator and the denominator by n^t, which transforms the AM term into (sum of (i/n)^t from 1 to n)/n, which in the limit is the definition of the Riemann integral of (x^t dx) from 0 to 1. All that's left is to compute the integral, which gives 1/(t+1), and plug that into the quotient, giving (t+1)/e^t.
@pavlopanasiuk7297
@pavlopanasiuk7297 11 месяцев назад
Same here. I am wondering however if I skipped part where we consider t+1
@complexquestion3601
@complexquestion3601 11 месяцев назад
@@pavlopanasiuk7297 Indeed, if t
@HagenvonEitzen
@HagenvonEitzen 11 месяцев назад
11:04 Well, "approximating too small" only holds if the integrand is increasing, in other words, if t>0
@user-en5vj6vr2u
@user-en5vj6vr2u 11 месяцев назад
Good point. You can also squeeze thm the GM and AM alone then you won’t have to worry about flipping inequalities
@ridefast0
@ridefast0 11 месяцев назад
Speaking of AM and GM, I enjoyed finding the 'hybrid' AGM in the formula for the exact period of a simple pendulum. Would that be worth a look, Michael?
@nirajmehta6424
@nirajmehta6424 11 месяцев назад
sounds very interesting!
@BilalAhmed-wo6fe
@BilalAhmed-wo6fe 8 месяцев назад
Sound interesting
@ridefast0
@ridefast0 8 месяцев назад
leapsecond.com/hsn2006/pendulum-period-agm.pdf
@peilingliu
@peilingliu 3 месяца назад
indeed gauss AGM yield pi fastest :) and also arttan
@adiaphoros6842
@adiaphoros6842 11 месяцев назад
Geomethic Arithmedian.
@maxwelljennings4178
@maxwelljennings4178 11 месяцев назад
bless you
@ruilopes6638
@ruilopes6638 11 месяцев назад
Shouldn’t our assumptions about t happen when we are looking for the inequalities on the AM. t been lesse than one there flips the inequalities the other way around. I believe what was calculated holds only for t>1
@ianjlilly
@ianjlilly 11 месяцев назад
John Cook has done some articles on these topics recently.
@zachbills8112
@zachbills8112 11 месяцев назад
I just used Stirling's Approximation up top and approximated the bottom sum by it's integral, which is valid asymptotically. This is simple enough to do in your head.
@blazeottozean469
@blazeottozean469 10 месяцев назад
Can we apply the limit of GM and AM separately (get some kind of infinity) then combine together to get the answer? Like: lim GM = lim n^t/e^t lim AM = lim n^t/(t+1)
@BongoFerno
@BongoFerno 11 месяцев назад
I'm never sure if this is serious math, or trolling non mathematicians people.
@cmilkau
@cmilkau 9 месяцев назад
Fun fact: the natural log of the geometric mean it's the arithmetic mean of the natural logs.
@nikhilprabhakar7116
@nikhilprabhakar7116 11 месяцев назад
Where is @goodplacetostop ???
@Ahmed-Youcef1959
@Ahmed-Youcef1959 11 месяцев назад
we really miss him
@minwithoutintroduction
@minwithoutintroduction 11 месяцев назад
22:24 رائع جدا كالعادة
@iGeen7
@iGeen7 11 месяцев назад
But what about t
@faradayawerty
@faradayawerty 11 месяцев назад
this is awesome
@gp-ht7ug
@gp-ht7ug 11 месяцев назад
Nice video! ❤️
@stevenmellemans7215
@stevenmellemans7215 11 месяцев назад
Why not the integral from 0 to n of x^t dt instead of adding the one?
@peilingliu
@peilingliu 3 месяца назад
❤interesting 😊
@bndrcr82a08e349g
@bndrcr82a08e349g 11 месяцев назад
Beautiful
@Alan-zf2tt
@Alan-zf2tt 11 месяцев назад
I think I may take up knitting 🙂
@stefanalecu9532
@stefanalecu9532 11 месяцев назад
I fully encourage you in this endeavor
@Alan-zf2tt
@Alan-zf2tt 11 месяцев назад
@@stefanalecu9532Thank you! I do not know whether to thank you or curse as there seems playful ambiguity on "this" I will take a finer interpretation and double up on "Thanks dood!" 🙂
@eugen9454
@eugen9454 11 месяцев назад
What was is used for? Because for a standalone publication is to easy, no?
@EinsteinsHair
@EinsteinsHair 11 месяцев назад
It has been 30 years since I looked at Mathematics Magazine, but this is probably not too easy. The magazine is aimed at undergraduate teachers and students. As I remember they also included Problems to solve. Also Proofs Without Words showing simple geometric proofs. Not exactly a formal Journal.
@juniorcyans2988
@juniorcyans2988 11 месяцев назад
Amazing🎉🎉🎉So fun❤❤❤
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