theorem Th7:
  Product(cF1^cF2) = Product(cF1) * Product(cF2)
proof
  thus Product(cF1^cF2)=multcomplex.(Product cF1,Product cF2)
      by AFINSQ_2:42
    .= Product(cF1)*Product(cF2) by BINOP_2:def 5;
end;
