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(** ** Injection from [nat] to [R]                       *)
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Lemma Rle_Rinv_depr : forall x y:R, 0 < x -> 0 < y -> x <= y -> / y <= / x.
#[deprecated(since="8.19",note="Use Rplus_sqr_eq_0.")]
Notation Rplus_sqr_eq_0_l := Rplus_sqr_eq_0_l_depr (only parsing).