let o, m be set ; :: thesis: for a, b being Object of (1Cat o,m)
for f being Morphism of (1Cat o,m) holds f is Morphism of a,b
let a, b be Object of (1Cat o,m); :: thesis: for f being Morphism of (1Cat o,m) holds f is Morphism of a,b
let f be Morphism of (1Cat o,m); :: thesis: f is Morphism of a,b
f in Hom a,b by Th36;
hence f is Morphism of a,b by Def7; :: thesis: verum