
theorem Th2:
  for L being reflexive antisymmetric with_infima RelStr for a
  being Element of L holds a "/\" a = a
proof
  let L be reflexive antisymmetric with_infima RelStr, a be Element of L;
  a <= a;
  then a "/\" a <= a & a <= a "/\" a by YELLOW_0:23;
  hence thesis by YELLOW_0:def 3;
end;
