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 Pythagoras knew it!! (Posted on 2010-03-05)
The basic arithmetic mean-geometric mean (AM-GM) inequality states simply that if x and y are nonnegative real numbers, then. (x+y)/2 ≥ √(x*y), with equality if and only if x = y.
There are various proofs for this theorem (for any number of values), inter alia Polya, Cauchy, by induction etc.
Now derive your proof directly from Pythagoras' formula a2+b2 = c2, a ≠ b.

 No Solution Yet Submitted by Ady TZIDON No Rating

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 re: my attempt | Comment 2 of 5 |
(In reply to my attempt by Daniel)

Nice attempt, Daniel! But presumably you could have started at line 6 of your solution, (c-a)^2 >= 0 which is true for all real numbers a and c.

Since the rest of the proof is still valid from that point on, perhaps, Pythagoras wasn't necessary!

 Posted by JayDeeKay on 2010-03-05 17:59:41

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