intros R a b H' H'0 H'1.
apply lem_redIn_nil with (aP := R) (Q := nil (A:=poly A0 eqA ltM)); auto.
Qed.
Remark lem_redln_cons :
forall (aP R Q : list (poly A0 eqA ltM)) (a b : poly A0 eqA ltM),
In a aP ->
In b aP ->
redIn a b aP Q R ->
forall (c : poly A0 eqA ltM) (Q1 : list (poly A0 eqA ltM)),
Q = c :: Q1 ->
red A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec c R ->
redIn a b aP Q1 R.
intros aP R Q a b H' H'0 H'1; elim H'1; auto.
intros P Q0 R0 a0 b0 H'2 H'3 c Q1 H'4 H'5.
apply redIn0b; auto.
apply H'3 with (c := c); auto.
intros P Q0 R0 a0 b0 H'2 c Q1 H'3 H'4.
rewrite H'3 in H'2; elim H'2; auto.
intros H'5; rewrite H'5 in H'4; auto.
intros P Q0 R0 a0 b0 c H'2 H'3 H'4 H'5 H'6 H'7 c0 Q1 H'8 H'9.
apply redIn2 with (c := c); auto.
apply H'4 with (c0 := c0); auto.
apply H'6 with (c0 := c0); auto.
Qed.

Theorem redln_cons :
forall (aP R Q : list (poly A0 eqA ltM)) (a b c : poly A0 eqA ltM),
In a aP ->
In b aP ->
redIn a b aP (c :: Q) R ->
red A A0 A1 eqA invA minusA multA divA eqA_dec n ltM ltM_dec c R ->
redIn a b aP Q R.