let it1, it2 be Function of [:COMPLEX,(Funcs (X, the carrier of Y)):],(Funcs (X, the carrier of Y)); :: thesis: ( ( for c being Complex
for f being Element of Funcs (X, the carrier of Y)
for x being Element of X holds (it1 . [c,f]) . x = c * (f . x) ) & ( for c being Complex
for f being Element of Funcs (X, the carrier of Y)
for x being Element of X holds (it2 . [c,f]) . x = c * (f . x) ) implies it1 = it2 )
assume that
A3: for c being Complex
for f being Element of Funcs (X, the carrier of Y)
for x being Element of X holds (it1 . [c,f]) . x = c * (f . x) and
A4: for c being Complex
for f being Element of Funcs (X, the carrier of Y)
for x being Element of X holds (it2 . [c,f]) . x = c * (f . x) ; :: thesis: it1 = it2

now :: thesis: for c being Element of COMPLEX
for f being Element of Funcs (X, the carrier of Y) holds it1 . (c,f) = it2 . (c,f)

let c be Element of COMPLEX ; :: thesis: for f being Element of Funcs (X, the carrier of Y) holds it1 . (c,f) = it2 . (c,f)
let f be Element of Funcs (X, the carrier of Y); :: thesis: it1 . (c,f) = it2 . (c,f)

now :: thesis: for x being Element of X holds (it1 . [c,f]) . x = (it2 . [c,f]) . x

let x be Element of X; :: thesis: (it1 . [c,f]) . x = (it2 . [c,f]) . x
thus (it1 . [c,f]) . x = c * (f . x) by A3
.= (it2 . [c,f]) . x by A4 ; :: thesis: verum

end;

hence it1 . (c,f) = it2 . (c,f) by FUNCT_2:63; :: thesis: verum

end;

hence it1 = it2 ; :: thesis: verum