let i, n be Nat; :: thesis: for f being Function of (TOP-REAL i),(TOP-REAL n) holds f (-) is Function of (TOP-REAL i),(TOP-REAL n)
set X = the carrier of (TOP-REAL i);
let f be Function of the carrier of (TOP-REAL i),(TOP-REAL n); :: thesis: f (-) is Function of (TOP-REAL i),(TOP-REAL n)
set g = f (-) ;
A1: dom (f (-)) = dom f by VALUED_2:def 34;
A2: dom f = the carrier of (TOP-REAL i) by FUNCT_2:def 1;
for x being object st x in the carrier of (TOP-REAL i) holds
(f (-)) . x in the carrier of (TOP-REAL n)
proof
let x be object ; :: thesis: ( x in the carrier of (TOP-REAL i) implies (f (-)) . x in the carrier of (TOP-REAL n) )
assume x in the carrier of (TOP-REAL i) ; :: thesis: (f (-)) . x in the carrier of (TOP-REAL n)
then reconsider x = x as Element of the carrier of (TOP-REAL i) ;
reconsider y = - x as Element of the carrier of (TOP-REAL i) ;
reconsider f = f as Function of the carrier of (TOP-REAL i),(TOP-REAL n) ;
(f (-)) . x = f . y by A1, A2, VALUED_2:def 34;
hence (f (-)) . x in the carrier of (TOP-REAL n) ; :: thesis: verum
end;
hence f (-) is Function of (TOP-REAL i),(TOP-REAL n) by A1, A2, FUNCT_2:3; :: thesis: verum