From 40afbcc473baf6de47012181f2b14356d4b8d23a Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Fri, 24 Jul 2009 22:05:44 +0000
Subject: [PATCH] No more hand-made coercions.

---
 helm/software/matita/nlibrary/algebra/magmas.ma | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/helm/software/matita/nlibrary/algebra/magmas.ma b/helm/software/matita/nlibrary/algebra/magmas.ma
index 22289b3c2..1c829997a 100644
--- a/helm/software/matita/nlibrary/algebra/magmas.ma
+++ b/helm/software/matita/nlibrary/algebra/magmas.ma
@@ -15,32 +15,24 @@
 include "sets/sets.ma".
 
 nrecord pre_magma : Type[1] ≝
- { carr: Type;
+ { carr:> Type;
    op: carr → carr → carr
  }.
-ncoercion carr: ∀M:pre_magma. Type ≝ carr on _M: pre_magma to Type.
 
 nrecord magma (A: pre_magma) : Type[1] ≝
- { mcarr: Ω \sup A;
+ { mcarr:> Ω \sup A;
    op_closed: ∀x,y. x ∈ mcarr → y ∈ mcarr → op A x y ∈ mcarr
  }.
-ncoercion mcarr: ∀A.∀M: magma A. Ω \sup A ≝ mcarr
- on _M: magma ? to Ω \sup ?.
 
 nrecord pre_magma_morphism (A,B: pre_magma) : Type ≝
- { mmcarr: A → B;
+ { mmcarr:1> A → B;
    mmprop: ∀x,y. mmcarr (op ? x y) = op ? (mmcarr x) (mmcarr y)
  }.
-ncoercion mmcarr: ∀A,B.∀M: pre_magma_morphism A B. A → B ≝ mmcarr
- on _M: pre_magma_morphism ? ? to ∀_.?.
 
 nrecord magma_morphism (A) (B) (Ma: magma A) (Mb: magma B) : Type ≝
- { mmmcarr: pre_magma_morphism A B;
+ { mmmcarr:> pre_magma_morphism A B;
    mmclosed: ∀x. x ∈ Ma → mmmcarr x ∈ Mb
  }.
-ncoercion mmmcarr : ∀A,B,Ma,Mb.∀f: magma_morphism A B Ma Mb. pre_magma_morphism A B
- ≝ mmmcarr
- on _f: magma_morphism ???? to pre_magma_morphism ??.
  
 ndefinition sub_magma ≝
  λA.λM1,M2: magma A. M1 ⊆ M2.
-- 
2.39.2