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IMO SL-5(2009)
Posted: Sun Mar 11, 2012 4:13 pm
by Sazid Akhter Turzo
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.)
Re: IMO SL-5(2009)
Posted: Sun Mar 11, 2012 7:00 pm
by *Mahi*
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.
Re: IMO SL-5(2009)
Posted: Mon Mar 12, 2012 2:35 pm
by nafistiham
*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