reserve A,B,C,Y,x,y,z for set, U, D for non empty set,
X for non empty Subset of D, d,d1,d2 for Element of D;
reserve P,Q,R for Relation, g for Function, p,q for FinSequence;
reserve f for BinOp of D, i,m,n for Nat;

theorem
(MultPlace(f)).(<*d*>) = d & for x being non empty FinSequence of D holds
(MultPlace(f)).(x^<*d*>) = f.((MultPlace(f)).x, d) by Lm15;
