reserve a, b, c, d, e for Complex;

theorem :: REAL_2'74
  a / b <> 0 implies b = a / (a / b)
proof
  assume
A1: a/b<>0;
  then b<>0 by Th49;
  then a/b*b = a by Lm3;
  hence thesis by A1,Lm9;
end;
