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Free_monoid.v
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(* This program is free software; you can redistribute it and/or *)
(* modify it under the terms of the GNU Lesser General Public License *)
(* as published by the Free Software Foundation; either version 2.1 *)
(* of the License, or (at your option) any later version. *)
(* *)
(* This program is distributed in the hope that it will be useful, *)
(* but WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *)
(* GNU General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU Lesser General Public *)
(* License along with this program; if not, write to the Free *)
(* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA *)
(* 02110-1301 USA *)
Set Implicit Arguments.
Unset Strict Implicit.
Require Export Monoid_cat.
Require Export Sgroup_facts.
Require Export Monoid_facts.
Require Export Monoid_util.
Section Free_monoid_def.
Variable V : SET.
Inductive FM : Type :=
| Var : V -> FM
| Law : FM -> FM -> FM
| Unit : FM.
Inductive eqFM : FM -> FM -> Prop :=
| eqFM_Var : forall x y : V, Equal x y -> (eqFM (Var x) (Var y):Prop)
| eqFM_law :
forall x x' y y' : FM,
eqFM x x' -> eqFM y y' -> (eqFM (Law x y) (Law x' y'):Prop)
| eqFM_law_assoc :
forall x y z : FM, eqFM (Law (Law x y) z) (Law x (Law y z)):Prop
| eqFM_law0r : forall x : FM, eqFM (Law x Unit) x:Prop
| eqFM_law0l : forall x : FM, eqFM (Law Unit x) x:Prop
| eqFM_refl : forall x : FM, eqFM x x:Prop
| eqFM_sym : forall x y : FM, eqFM x y -> (eqFM y x:Prop)
| eqFM_trans : forall x y z : FM, eqFM x y -> eqFM y z -> (eqFM x z:Prop).
Hint Resolve eqFM_Var eqFM_law eqFM_law_assoc eqFM_law0r eqFM_law0l
eqFM_refl: algebra.
Hint Immediate eqFM_sym: algebra.
Lemma eqFM_Equiv : equivalence eqFM.
red in |- *.
split; [ try assumption | idtac ].
exact eqFM_refl.
red in |- *.
split; [ try assumption | idtac ].
exact eqFM_trans.
exact eqFM_sym.
Qed.
Definition FM_set := Build_Setoid eqFM_Equiv.
Definition FreeMonoid : MONOID.
apply (BUILD_MONOID (E:=FM_set) (genlaw:=Law) (e:=Unit)).
exact eqFM_law.
exact eqFM_law_assoc.
exact eqFM_law0r.
exact eqFM_law0l.
Defined.
Section Universal_prop.
Variable M : MONOID.
Variable f : Hom V M.
Fixpoint FM_lift_fun (p : FreeMonoid) : M :=
match p with
| Var v => f v
| Law p1 p2 => sgroup_law _ (FM_lift_fun p1) (FM_lift_fun p2)
| Unit => monoid_unit M
end.
Definition FM_lift : Hom FreeMonoid M.
apply (BUILD_HOM_MONOID (G:=FreeMonoid) (G':=M) (ff:=FM_lift_fun)).
intros x y H'; try assumption.
elim H'; simpl in |- *; auto with algebra.
intros x0 y0 z H'0 H'1 H'2 H'3; try assumption.
apply Trans with (FM_lift_fun y0); auto with algebra.
simpl in |- *; auto with algebra.
simpl in |- *; auto with algebra.
Defined.
Definition FM_var : Hom V FreeMonoid.
apply (Build_Map (A:=V) (B:=FreeMonoid) (Ap:=Var)).
red in |- *.
simpl in |- *; auto with algebra.
Defined.
Lemma FM_comp_prop :
Equal f (comp_hom (FM_lift:Hom (FreeMonoid:SET) M) FM_var).
simpl in |- *.
red in |- *.
simpl in |- *.
auto with algebra.
Qed.
End Universal_prop.
End Free_monoid_def.
Hint Resolve FM_comp_prop: algebra.