AM-GM Inequality | Arithmetic Mean Geometric Mean Inequality

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In this video we give a proof of the AM-GM Inequality, that is the arithmetic mean geometric mean inequality. Our proof follows that outlined in Cambridge Part 3 2018 problem 5. It is a nice application of calculus and inequalities to establish the AM-GM inequality.

#ArithmeticMeanGeometricMeanInequality #AMGMInequality #Inequalities

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In the final arguments a_3=G_2 so a_3^2=a_1a_2 and hence a_3=a_1=a_2

ProfOmarMath
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I have studied am gm but not seen proof but now i understand nyc vedio

deepjyoti
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And what about exp(ln .... + ln an)/n)? ln is concave function.

tgx
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Sir nice video again, also is there a way to prove GM HM inequality

akshataggarwal
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i expect that at the time 10 march 2022 you will have more than 25000 subscribers!

aashsyed
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At 11:42, I am not sure I follow the calculation. You have:
(a3/G2)^(1/3) = 1
(a3/G2) = 1
...
a3 = cuberoot(a1a2a3) = G3.
I am not sure how the G2 became G3 here.
The computation still makes sense because it is clear that a_i=a_j (i != j) for all distinct i and j if and only if An = Gn = a1, for all n, so the values for An and Gn remain constant as n changes. However, since this is what you are trying to prove here, this doesn't quite hold. I think that the computation is supposed to be that:

(a3/G2)^(1/3) = 1
(a3/G2) = 1
a3 = G2 = sqrt(a1a2)
a3^2 = a1a2 = a1^2
a3 = a1, and similar for other \lambda_k values.

That said, love the video and your content!

bencheesecake
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Can you please make a video on how to convert absolute value functions to piecewise functions? Take some complex examples like involving e^x, etc please.

VishnuSrivatsava
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At the end you make a small error, you keep evealuating G_n at G_n+1, however the correct evaluation yields same result luckily

tomatrix
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Hi ProfOmar. Nice proof of the AM-GM inequality, thanks for posting, but might be a little difficult for some people to follow. I have an alternative proof which I believe is a bit easier to follow. If you're interested to see this, let me know. Alex Z, Maths Tutor.

azmath
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i am going to to prove am-gm inequality when n=2

aashsyed