Question Number 50396 by Abdo msup. last updated on 16/Dec/18
$${finf}\:{all}\:{functions}\:{f}\:{continues}\:{with}\:{verfy} \\ $$$${f}\left(\mathrm{2}{x}+\mathrm{1}\right)={f}\left({x}\right)\:\:\forall{x}\in{R} \\ $$
finf-all-functions-f-continues-with-verfy-f-2x-1-f-x-x-R-