
(/VERSIONCHECK 2) 

(DEFPARAMETER |OrderedCancellationAbelianMonoid;AL| 'NIL) 

(DEFUN |OrderedCancellationAbelianMonoid| ()
  (LET (#:G1817)
    (COND
      (|OrderedCancellationAbelianMonoid;AL|)
      (T (SETQ |OrderedCancellationAbelianMonoid;AL|
               (|OrderedCancellationAbelianMonoid;|)))))) 

(DEFUN |OrderedCancellationAbelianMonoid;| ()
  (PROG (#0=#:G1815)
    (RETURN
      (PROG1 (LETT #0#
                   (|Join| (|OrderedAbelianMonoid|)
                           (|CancellationAbelianMonoid|))
                   |OrderedCancellationAbelianMonoid|)
        (SETELT #0# 0 '(|OrderedCancellationAbelianMonoid|)))))) 

(MAKEPROP '|OrderedCancellationAbelianMonoid| 'NILADIC T) 
