 ### lagrange_inequality: removed a Coq proof

parent 1bc757e2
 (* This file is generated by Why3's Coq driver *) (* Beware! Only edit allowed sections below *) Require Import BuiltIn. Require Reals.R_sqrt. Require BuiltIn. Require real.Real. Require real.Square. (* Why3 assumption *) Definition dot (x1:R) (x2:R) (y1:R) (y2:R): R := ((x1 * y1)%R + (x2 * y2)%R)%R. (* Why3 assumption *) Definition norm2 (x1:R) (x2:R): R := ((Reals.RIneq.Rsqr x1) + (Reals.RIneq.Rsqr x2))%R. Axiom norm2_pos : forall (x1:R) (x2:R), (0%R <= (norm2 x1 x2))%R. Axiom Lagrange : forall (a1:R) (a2:R) (b1:R) (b2:R), (((norm2 a1 a2) * (norm2 b1 b2))%R = ((Reals.RIneq.Rsqr (dot a1 a2 b1 b2)) + (Reals.RIneq.Rsqr ((a1 * b2)%R - (a2 * b1)%R)%R))%R). Axiom CauchySchwarz_aux : forall (x1:R) (x2:R) (y1:R) (y2:R), ((Reals.RIneq.Rsqr (dot x1 x2 y1 y2)) <= ((norm2 x1 x2) * (norm2 y1 y2))%R)%R. (* Why3 assumption *) Definition norm (x1:R) (x2:R): R := (Reals.R_sqrt.sqrt (norm2 x1 x2)). Axiom norm_pos : forall (x1:R) (x2:R), (0%R <= (norm x1 x2))%R. Require Import Why3. Ltac ae := why3 "Alt-Ergo,0.99.1," timelimit 3; admit. Import R_sqrt. Open Scope R_scope. (* Why3 goal *) Theorem sqr_le_sqrt : forall (x:R) (y:R), ((Reals.RIneq.Rsqr x) <= y)%R -> (x <= (Reals.R_sqrt.sqrt y))%R. (* Why3 intros x y h1. *) intros x y h1. assert (0 <= Rsqr x) by ae. assert (0 <= y) by ae. assert (h : (x < 0 \/ x >= 0)%R). ae. destruct h. ae. replace x with (sqrt (Rsqr x)). apply sqrt_le_1. ae. ae. ae. ae. Admitted.
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