Open Scope Z_scope.
(* Pierre L: examples gathered while debugging romega. *)
(* Starting from Coq 8.9 (late 2018), `romega` tactics are deprecated. The tests in this file remain but now call the `lia` tactic. *)

Lemma test_lia_7b : forall z,
0>=0 /\ z=0 \/ 0<=0 /\ z =0 -> 1 = z+1.