#[deprecated(since="8.19",note="Use Rinv_le_contravar.")]
Notation Rle_Rinv := Rle_Rinv_depr (only parsing).#[deprecated(since="8.19",note="Use the bidirectional version Rlt_0_minus instead.")]
Notation Rlt_Rminus := (fun a b => proj2 (Rlt_0_minus a b)) (only parsing).#[deprecated(since="8.19",note="Use the bidirectional version Rlt_0_minus instead.")]
Notation Rminus_gt_0_lt := (fun a b => proj1 (Rlt_0_minus a b)) (only parsing).#[deprecated(since="8.19",note="Use Rdiv_opp_l.")]
Notation Ropp_div := (fun x y => Rdiv_opp_l x y) (only parsing).

Lemma Rplus_sqr_eq_0_l_depr : forall r1 r2, Rsqr r1 + Rsqr r2 = 0 -> r1 = 0.