From 7ebc185986cad7b4d0be3be855ead48236b7d5d5 Mon Sep 17 00:00:00 2001
From: Robbert Krebbers <mail@robbertkrebbers.nl>
Date: Thu, 11 Feb 2016 20:10:27 +0100
Subject: [PATCH] Revert "prelude: add notation for > and >= for all kinds of
 numbers"

This reverts commit 24fa20e5f8a2042caa19f1f6505102c5434cce54.

Although these symmetric variants sometimes look "better", they
are really annoying and should IMHO never be used:

1.) For lemmas there is now a choice between >= and <=. Since there is
no longer a canonical choice, it is very easy to introduce a lot of
inconsistencies in statements of lemmas.

2.) For automation the situation becomes annoying, you have to built in
stuff for both >= and <=. That is very error-prone.

3.) For N and Z the notions x <= y and y >= x are not even convertible!
That means that done/by does not solve x <= y if you have y >= x and if
avoids you applying certain lemmas.
---
 theories/numbers.v | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/theories/numbers.v b/theories/numbers.v
index 023f91f4..65b9621e 100644
--- a/theories/numbers.v
+++ b/theories/numbers.v
@@ -28,10 +28,6 @@ Notation "x ≤ y ≤ z ≤ z'" := (x ≤ y ∧ y ≤ z ∧ z ≤ z')%nat : nat_
 Notation "(≤)" := le (only parsing) : nat_scope.
 Notation "(<)" := lt (only parsing) : nat_scope.
 
-Infix "≥" := ge : nat_scope.
-Notation "(≥)" := ge (only parsing) : nat_scope.
-Notation "(>)" := gt (only parsing) : nat_scope.
-
 Infix "`div`" := Nat.div (at level 35) : nat_scope.
 Infix "`mod`" := Nat.modulo (at level 35) : nat_scope.
 
@@ -108,10 +104,6 @@ Notation "(<)" := Pos.lt (only parsing) : positive_scope.
 Notation "(~0)" := xO (only parsing) : positive_scope.
 Notation "(~1)" := xI (only parsing) : positive_scope.
 
-Infix "≥" := Pos.ge : positive_scope.
-Notation "(≥)" := Pos.ge (only parsing) : positive_scope.
-Notation "(>)" := Pos.gt (only parsing) : positive_scope.
-
 Arguments Pos.of_nat _ : simpl never.
 Instance positive_eq_dec: ∀ x y : positive, Decision (x = y) := Pos.eq_dec.
 Instance positive_inhabited: Inhabited positive := populate 1.
@@ -187,11 +179,6 @@ Notation "x < y ≤ z" := (x < y ∧ y ≤ z)%N : N_scope.
 Notation "x ≤ y ≤ z ≤ z'" := (x ≤ y ∧ y ≤ z ∧ z ≤ z')%N : N_scope.
 Notation "(≤)" := N.le (only parsing) : N_scope.
 Notation "(<)" := N.lt (only parsing) : N_scope.
-
-Infix "≥" := N.ge : N_scope.
-Notation "(≥)" := N.ge (only parsing) : N_scope.
-Notation "(>)" := N.gt (only parsing) : N_scope.
-
 Infix "`div`" := N.div (at level 35) : N_scope.
 Infix "`mod`" := N.modulo (at level 35) : N_scope.
 
@@ -226,10 +213,6 @@ Notation "x ≤ y ≤ z ≤ z'" := (x ≤ y ∧ y ≤ z ∧ z ≤ z') : Z_scope.
 Notation "(≤)" := Z.le (only parsing) : Z_scope.
 Notation "(<)" := Z.lt (only parsing) : Z_scope.
 
-Infix "≥" := Z.ge : Z_scope.
-Notation "(≥)" := Z.ge (only parsing) : Z_scope.
-Notation "(>)" := Z.gt (only parsing) : Z_scope.
-
 Infix "`div`" := Z.div (at level 35) : Z_scope.
 Infix "`mod`" := Z.modulo (at level 35) : Z_scope.
 Infix "`quot`" := Z.quot (at level 35) : Z_scope.
@@ -345,10 +328,6 @@ Notation "x ≤ y ≤ z ≤ z'" := (x ≤ y ∧ y ≤ z ∧ z ≤ z') : Qc_scope
 Notation "(≤)" := Qcle (only parsing) : Qc_scope.
 Notation "(<)" := Qclt (only parsing) : Qc_scope.
 
-Infix "≥" := Qcge : Qc_scope.
-Notation "(≥)" := Qcge (only parsing) : Qc_scope.
-Notation "(>)" := Qcgt (only parsing) : Qc_scope.
-
 Hint Extern 1 (_ ≤ _) => reflexivity || discriminate.
 Arguments Qred _ : simpl never.
 
-- 
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