reserve x,y,z for set;
reserve f,f1,f2,f3 for FinSequence,
  p,p1,p2,p3 for set,
  i,k for Nat;

theorem
  for A being set st A c= dom f1 holds (f1^f2)|A = f1 | A by Th10,GRFUNC_1:27;
