reserve A,B,C for Category,
  F,F1 for Functor of A,B;
reserve o,m for set;
reserve t for natural_transformation of F,F1;

theorem Th30:
  for F,G being Functor of A, [:B,C:] st Pr1 F = Pr1 G & Pr2 F =
  Pr2 G holds F = G
by FUNCT_3:80;
