reserve s for set,
  i,j for Nat,
  c,c1,c2,c3 for Complex,
  F,F1,F2 for complex-valued FinSequence,
  R,R1,R2 for i-element complex-valued FinSequence;

theorem Th29:
  Sum(<*> COMPLEX) = 0c by BINOP_2:1,FINSOP_1:10;
