for x1, x2 being set
for A being non empty set st A = {x1,x2} & x1 <> x2 holds
ex f, g being Element of Funcs (A,COMPLEX) st
for h being Element of Funcs (A,COMPLEX) ex a, b being Complex st h = (ComplexFuncAdd A) . (((ComplexFuncExtMult A) . [a,f]),((ComplexFuncExtMult A) . [b,g]))