proposition: Lemma inclusion_t_r_t A (r r' r'': relation A) : r ⊆ r'' -> r' ⊆ r'' ＊ -> r⁺ ⨾ r' ⊆ r''⁺.
proof: Proof. by ins; rewrite H, H0, ct_rt. Qed.
imports: Program.Basics Arith micromega.Lia Permutation List Setoid HahnBase HahnList HahnRelationsBasic HahnSets