#[deprecated(since="8.19")]
Notation single_z_r_R1 := single_z_r_R1_depr (only parsing).

Lemma tech_single_z_r_R1_depr : forall r (n:Z), r < IZR n -> IZR n <= r + 1 -> (exists s : Z, s <> n /\ r < IZR s /\ IZR s <= r + 1) -> False.