set f = the carrier of X --> (0. Y);
A1: the carrier of X --> (0. Y) is homogeneous

proof

let x be VECTOR of X; :: according to CLOPBAN1:def 3 :: thesis: for r being Complex holds ( the carrier of X --> (0. Y)) . (r * x) = r * (( the carrier of X --> (0. Y)) . x)
let c be Complex; :: thesis: ( the carrier of X --> (0. Y)) . (c * x) = c * (( the carrier of X --> (0. Y)) . x)
thus ( the carrier of X --> (0. Y)) . (c * x) = 0. Y by FUNCOP_1:7
.= c * (0. Y) by CLVECT_1:1
.= c * (( the carrier of X --> (0. Y)) . x) by FUNCOP_1:7 ; :: thesis: verum

end;

the carrier of X --> (0. Y) is additive

proof

let x, y be VECTOR of X; :: according to VECTSP_1:def 19 :: thesis: ( the carrier of X --> (0. Y)) . (x + y) = (( the carrier of X --> (0. Y)) . x) + (( the carrier of X --> (0. Y)) . y)
thus ( the carrier of X --> (0. Y)) . (x + y) = 0. Y by FUNCOP_1:7
.= (0. Y) + (0. Y) by RLVECT_1:4
.= (( the carrier of X --> (0. Y)) . x) + (0. Y) by FUNCOP_1:7
.= (( the carrier of X --> (0. Y)) . x) + (( the carrier of X --> (0. Y)) . y) by FUNCOP_1:7 ; :: thesis: verum

end;

hence not LinearOperators (X,Y) is empty by A1, Def4; :: thesis: LinearOperators (X,Y) is functional
let x be object ; :: according to FUNCT_1:def 13 :: thesis: ( not x in LinearOperators (X,Y) or x is set )
thus ( not x in LinearOperators (X,Y) or x is set ) ; :: thesis: verum