proposition: Lemma inter_restr_absorb_l (s : A -> Prop) r r' : restr_rel s r ∩ restr_rel s r' ≡ r ∩ restr_rel s r'.
proof: Proof. u. Qed.
imports: Program.Basics Arith micromega.Lia Permutation List Setoid HahnBase HahnList HahnRelationsBasic HahnSets