let x1, x2 be set ; :: thesis: for C being Category
for c being Object of
for p1, p2 being Morphism of st cod p1 = c & cod p2 = c holds
x1,x2 --> p1,p2 is Injections_family of c,{x1,x2}
let C be Category; :: thesis: for c being Object of
for p1, p2 being Morphism of st cod p1 = c & cod p2 = c holds
x1,x2 --> p1,p2 is Injections_family of c,{x1,x2}
let c be Object of ; :: thesis: for p1, p2 being Morphism of st cod p1 = c & cod p2 = c holds
x1,x2 --> p1,p2 is Injections_family of c,{x1,x2}
let p1, p2 be Morphism of ; :: thesis: ( cod p1 = c & cod p2 = c implies x1,x2 --> p1,p2 is Injections_family of c,{x1,x2} )
assume A1: ( cod p1 = c & cod p2 = c ) ; :: thesis: x1,x2 --> p1,p2 is Injections_family of c,{x1,x2}
cods (x1,x2 --> p1,p2) = x1,x2 --> (cod p1),(cod p2) by Th11
.= {x1,x2} --> c by A1, FUNCT_4:68 ;
hence x1,x2 --> p1,p2 is Injections_family of c,{x1,x2} by Def17; :: thesis: verum