theorem Th26:
  the carrier of MultiSet_over X = Funcs(X,NAT) & the multF of
  MultiSet_over X = (addnat,NAT).:X & 1.MultiSet_over X = X --> 0
proof
  the multMagma of <NAT,+,0> = <NAT,+> & the_unity_wrt op(<NAT,+>) = 0 by
MONOID_0:40,def 22;
  hence thesis by Th17,Th22,MONOID_0:46;
end;
