Fréchet functional equations with restricted spans: Solution on real numbers
Wanchitra Towanlong, Paisan Nakmahachalasint*
ABSTRACT: Our aim is to determine the general solution of the Fréchet functional equation, Δh1,...,hm+1f(x)=0, when the span hi is restricted to an open interval (ai,bi) for each i=1,...,m+1.