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Topic: proof of an inequality
Replies: 12   Last Post: Apr 24, 2013 9:02 AM

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Posts: 780
Registered: 7/12/10
Re: proof of an inequality
Posted: Apr 23, 2013 10:55 AM
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On Tuesday, April 23, 2013 3:28:44 PM UTC+1, oercim wrote:
> Sorry, you are right, so let modify:
> x1^2+x2^2+....+xn^2>=ave(x)^2
> does this inequality always hold? Thanks a lot.

Ok, I solved it. Just giving the answer won't help much.
Try looking at related problems that are simpler.
For example, what happens if n is small such as 1, 2 or 3?
What happens if you replace squaring by an even simpler function?


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