theorem Th33:
  F is commutative associative & F is having_a_unity & e =
the_unity_wrt F & G.(e,e) = e & (for d1,d2,d3,d4 holds F.(G.(d1,d2),G.(d3,d4))=
  G.(F.(d1,d3),F.(d2,d4))) implies G.(F"**"T1,F"**"T2) = F "**"(G.:(T1,T2))
proof
  len T1 = i & len T2 = i by CARD_1:def 7;
  hence thesis by Th32;
end;
