perhaps a TST

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SANZEED
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Joined:Wed Dec 28, 2011 6:45 pm
Location:Mymensingh, Bangladesh
perhaps a TST

Unread post by SANZEED » Mon May 14, 2012 12:55 am

find all continuous functions $f:\mathbb R\rightarrow \mathbb R$ such that,
\[f(f(x))=f(x)+2x\]

It is a Belarus TST problem, as I suppose.
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