Sindbad~EG File Manager

 int powerin(term, term, term *, int *);
 int cancel(term,term, term *, term *);
 int supercancel(term,term, term *, term *);
 void mfracts(term,term,term *);
 void naive_listgcd(term *, int, term *);
 void naive_gcd(term,term,term *);
 void ratgcd(term,term,term *);
 void ratgcd2(term, term, term *);
 void listratgcd2(term *, unsigned short, term *);
 void naive_lcm(term,term,term *);
 void naive_listlcm(term, term *);
 int eqtest(term,term);    /* called in polynoms.c as well as cancel.c */
 int contains_undefined(term);
int cancel_aux(term, term, term *);  /* not exported */