
theorem
  for L being antisymmetric reflexive with_infima RelStr for a,b being
  Element of L holds a = a"/\"b iff a <= b
proof
  let L be antisymmetric reflexive with_infima RelStr;
  let a,b be Element of L;
  a <= a & for d being Element of L st d <= a & d <= b holds a >= d;
  hence thesis by Th23;
end;
