theorem Th32: :: ISOCAT_2:34

for A, B, C being Category
for F being Functor of A,B
for G being Functor of A,C
for a, b being Object of A st Hom (a,b) <> {} holds
for f being Morphism of a,b holds <:F,G:> . f = [(F . f),(G . f)] by FUNCT_3:59;