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
  R - (i|-> 0c) = R
proof
A1: R is i-element FinSequence of COMPLEX by FINSEQ_1:102;
  thus R - (i|-> 0c) = R + (i|->(-0)) by Th8
    .= R by A1,BINOP_2:1,FINSEQOP:56;
end;
