IMO SL-5(2009)

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Sazid Akhter Turzo
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IMO SL-5(2009)

Unread post by Sazid Akhter Turzo » Sun Mar 11, 2012 4:13 pm

Let f be any function that maps the set of real numbers into the set of
real numbers. Prove that there exist real numbers x and y such that
$f(x−f(y)) > yf(x)+x$

(I didn't use LaTeX.)

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*Mahi*
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Re: IMO SL-5(2009)

Unread post by *Mahi* » Sun Mar 11, 2012 7:00 pm

Why didn't you use LaTeX? It isn't that hard, just put a dollar sign before and after your equation, and done. For advanced symbols,the vocabulary is easy too.
Please read Forum Guide and Rules before you post.

Use $L^AT_EX$, It makes our work a lot easier!

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nafistiham
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Re: IMO SL-5(2009)

Unread post by nafistiham » Mon Mar 12, 2012 2:35 pm

*Mahi* wrote:Why didn't you use LaTeX? It isn't that hard, just put a dollar sign before and after your equation, and done. For advanced symbols,the vocabulary is easy too.
* just click any equation you see in latex
* use the equation editor for learnig
* have a look over the links in '*Mahi*'s signature
it is really easy and looks really beautiful and tidy
\[\sum_{k=0}^{n-1}e^{\frac{2 \pi i k}{n}}=0\]
Using $L^AT_EX$ and following the rules of the forum are very easy but really important, too.Please co-operate.
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