let A be non empty set ; for f, g being Element of Funcs (A,COMPLEX) holds (ComplexFuncAdd A) . (f,g) = (ComplexFuncAdd A) . (g,f)
let f, g be Element of Funcs (A,COMPLEX); (ComplexFuncAdd A) . (f,g) = (ComplexFuncAdd A) . (g,f)
hence
(ComplexFuncAdd A) . (f,g) = (ComplexFuncAdd A) . (g,f)
by FUNCT_2:63; verum