Inductive ppcm (p q : Term A n) : Term A n -> Prop :=
    ppcm0 :
      forall s : Term A n,
      (forall r : Term A n, divP r p -> divP r q -> divP r s) ->
      divP s p -> divP s q -> ppcm p q s.Inductive ppcm (p q : Term A n) : Term A n -> Prop :=
    ppcm0 :
      forall s : Term A n,
      (forall r : Term A n, divP r p -> divP r q -> divP r s) ->
      divP s p -> divP s q -> ppcm p q s.

Theorem multTerm_eqTerm_inv : forall a b c : Term A n, eqTerm (A:=A) eqA (n:=n) (multTerm (A:=A) multA (n:=n) a b) (multTerm (A:=A) multA (n:=n) a c) -> ~ zeroP (A:=A) A0 eqA (n:=n) a -> eqTerm (A:=A) eqA (n:=n) b c.