Section gram5.
Variable X : Ensf.
Variable V1 R1 : Ensf.
Variable S1 : Elt.
Variable V2 R2 : Ensf.
Variable S2 : Elt.
Let S' := zero.
Let G1 := imageGram (injproducg V1) X V1 R1 S1.
Let G2 := imageGram (injproducd V2) X V2 R2 S2.
Let X1' := fst G1.
Let GG1 := snd G1.
Let V1' := fst GG1.
Let GGG1 := snd GG1.
Let R1' := fst GGG1.
Let S1' := snd GGG1.
Let X2' := fst G2.
Let GG2 := snd G2.
Let V2' := fst GG2.
Let GGG2 := snd GG2.
Let R2' := fst GGG2.
Let S2' := snd GGG2.
Let Gim := Gunion_disj_p V1' R1' S1' V2' R2' S2' S'.
Let Vu := fst Gim.
Let C' := snd Gim.
Let Ru := fst C'.
Let Su := snd C'.
Hypothesis Grammaire1 : isGram X V1 R1 S1.
Hypothesis Grammaire2 : isGram X V2 R2 S2.
Hint Resolve Grammaire1.
Hint Resolve Grammaire2.
apply isGram1 with V1 R1 S1.
auto.
Qed.
Hint Resolve Mots_X.
apply isGram2 with R1 S1.
auto.
Qed.
Hint Resolve int_X_V1_empty.

Lemma int_X_V2_empty : inter X V2 empty.