Remark CombLinear_trans1 :
 forall (a : list (Term A n)) (R : list (poly A0 eqA ltM)),
 CombLinear A A0 eqA plusA multA eqA_dec n ltM ltM_dec R a ->
 forall (b : poly A0 eqA ltM) (Q : list (poly A0 eqA ltM)),
 R = addEnd b Q ->
 CombLinear A A0 eqA plusA multA eqA_dec n ltM ltM_dec Q
   (s2p A A0 eqA n ltM b) ->
 CombLinear A A0 eqA plusA multA eqA_dec n ltM ltM_dec Q a.

Theorem Cb_trans : forall (a b : poly A0 eqA ltM) (Q : list (poly A0 eqA ltM)), Cb a (addEnd b Q) -> Cb b Q -> Cb a Q.