theorem
  n <> 0 implies (n+1)/n > 1
proof
  assume
A1: n<>0;
  (n+1)/n=n/n+1/n by XCMPLX_1:62
    .=1+1/n by A1,XCMPLX_1:60;
  hence thesis by A1,XREAL_1:29;
end;
