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Ceva derivabilitate

Posted: Sun Feb 28, 2010 7:01 pm
by andy crisan
Sa se determine functiile \( f,g:\mathbb{R}\rightarrow\mathbb{R} \) astfel incat \( f \) sa fie derivabila si sa se verifice ecuatia functionala:
\( f^{\prime}(x+g(y))=g(x)+y \forall x,y\in\mathbb{R} \)


GM

Posted: Sun Feb 28, 2010 8:37 pm
by Marius Mainea
\( f(x)=\frac{x^2}{2}+k \) ,\( g(x)=x \) sau \( f(x)=-\frac{x^2}{2}+k \) , \( g(x)=-x \)