reserve E for non empty set;
reserve a for Element of E;
reserve A, B for Subset of E;
reserve Y for set;
reserve p for FinSequence;
reserve e, e1, e2 for Singleton of E;

theorem Th16:
  for E being finite non empty set, A,B being Event of E st A
  misses B holds prob(A /\ B) = 0
by CARD_1:27;
