
(DECLAIM (NOTINLINE |AbelianGroup;|)) 

(DEFPARAMETER |AbelianGroup;AL| 'NIL) 

(DEFUN |AbelianGroup| ()
  (COND (|AbelianGroup;AL|) (T (SETQ |AbelianGroup;AL| (|AbelianGroup;|))))) 

(DEFUN |AbelianGroup;| ()
  (SPROG ((#1=#:G2 NIL))
         (PROG1
             (LETT #1#
                   (|Join| (|CancellationAbelianMonoid|)
                           (|mkCategory|
                            '(((- (% %)) T) ((- (% % %)) T)
                              ((* (% (|Integer|) %)) T))
                            NIL NIL NIL)))
           (SETELT #1# 0 '(|AbelianGroup|))))) 
