FE

For discussing Olympiad Level Algebra (and Inequality) problems
shehab ahmed
Posts: 66
Joined: Tue Mar 20, 2012 12:52 am

FE

Unread post by shehab ahmed » Fri Jun 15, 2012 8:32 pm

Find all functions $f:\mathbb R \mapsto \mathbb R$ such that $f(f(x+y))=f(x+y) +f(x)f(y) - xy$

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