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 Th8:
  -(i|->c) = i|->-c
proof
  reconsider s=c as Element of COMPLEX by XCMPLX_0:def 2;
  -(i|->s) = i|->(compcomplex.s) by FINSEQOP:16
          .= i|->-c by BINOP_2:def 1;
  hence thesis;
end;
