;;; NUM (p)                                                          [FUNCTION]
;;;
;;; DENOM (p)                                                        [FUNCTION]
;;;
;;; RAT-SIMPLIFY-2 (num denom)                                       [FUNCTION]
;;;
;;; RAT-SIMPLIFY (p)                                                 [FUNCTION]
;;;
;;; RAT+ (p q)                                                       [FUNCTION]
;;;
;;; RAT- (p q)                                                       [FUNCTION]
;;;
;;; RAT* (p q)                                                       [FUNCTION]
;;;
;;; RAT/ (p q)                                                       [FUNCTION]
;;;
;;; SCALAR-TIMES-RAT (scalar p)                                      [FUNCTION]
;;;
;;; SCALAR-DIV-RAT (scalar p)                                        [FUNCTION]
;;;
;;; RAT-ZEROP (p)                                                    [FUNCTION]
;;;
;;; RAT-UMINUS (p)                                                   [FUNCTION]
;;;
;;; RAT-EXPT (p n)                                                   [FUNCTION]
;;;
;;; RAT-CONSTANT (c n)                                               [FUNCTION]
;;;    Make a constant rational function equal to c with n variables
;;;
;;; RAT-TO-POLY (p)                                                  [FUNCTION]
;;;    Attempt to convert a rational function to a polynomial by
;;;    dividing numerator by denominator. Error if not divisible
;;;