theorem Th11:
  for G1 being Group-like non empty multMagma holds
    <*G1*> is Group-like multMagma-Family of {1}
proof
  let G1 be Group-like non empty multMagma;
  reconsider A = <*G1*> as multMagma-Family of {1};
  A is Group-like
  proof
    let x be Element of {1};
    x = 1 by TARSKI:def 1;
    hence thesis;
  end;
  hence thesis;
end;
