reserve a,b,c,d for Real;
reserve r,s for Real;

theorem
  0 < a & a < b implies 1 < b/a
proof
  assume
A1: a > 0;
  assume
A2: a < b;
  assume b/a <= 1;
  then b/a*a <= 1*a by A1,Lm12;
  hence thesis by A1,A2,XCMPLX_1:87;
end;
