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;
