code: public static <A extends Number & Comparable<?>> NumberExpression<Double> exp(Expression<A> num) {
          return Expressions.numberOperation(Double.class, Ops.MathOps.EXP, num);
      }
docs: Create a {@code exp(num)} expression
  
  <p>Returns the base-e exponential function of num, which is e raised to the power num.</p>
  
  @param num numeric expression
  @return exp(num)