1 (**************************************************************************)
4 (* ||A|| A project by Andrea Asperti *)
6 (* ||I|| Developers: *)
7 (* ||T|| The HELM team. *)
8 (* ||A|| http://helm.cs.unibo.it *)
10 (* \ / This file is distributed under the terms of the *)
11 (* v GNU General Public License Version 2 *)
13 (**************************************************************************)
17 record directed : Type ≝ {
19 dir_op: dir_carr → dir_carr → dir_carr;
20 dir_op_refl: ∀x.dir_op x x ≈ x;
21 dir_op_comm: ∀x,y:dir_carr. dir_op x y ≈ dir_op y x;
22 dir_op_assoc: ∀x,y,z:dir_carr. dir_op x (dir_op y z) ≈ dir_op (dir_op x y) z;
23 dir_strong_extop: ∀x.strong_ext ? (dir_op x)
27 λl:directed.λa,b:dir_carr l.ap_apart (dir_carr l) a (dir_op l a b).
29 lemma excess_of_directed: directed → excess.
30 intro l; apply (mk_excess (dir_carr l) (excl l));
31 [ intro x; unfold; intro H; unfold in H; apply (ap_coreflexive (dir_carr l) x);
32 apply (ap_rewr ??? (dir_op l x x) (dir_op_refl ? x)); assumption;
33 | intros 3 (x y z); unfold excl; intro H;
34 cases (ap_cotransitive ??? (dir_op l (dir_op l x z) y) H) (H1 H2); [2:
35 left; apply ap_symmetric; apply (dir_strong_extop ? y);
36 apply (ap_rewl ???? (dir_op_comm ???));
37 apply (ap_rewr ???? (dir_op_comm ???));
39 cases (ap_cotransitive ??? (dir_op l x z) H1) (H2 H3); [left; assumption]
40 right; apply (dir_strong_extop ? x); apply (ap_rewr ???? (dir_op_assoc ????));
44 record prelattice : Type ≝ {
46 meet: pl_carr → pl_carr → pl_carr;
47 meet_refl: ∀x.meet x x ≈ x;
48 meet_comm: ∀x,y:pl_carr. meet x y ≈ meet y x;
49 meet_assoc: ∀x,y,z:pl_carr. meet x (meet y z) ≈ meet (meet x y) z;
50 strong_extm: ∀x.strong_ext ? (meet x);
51 le_to_eqm: ∀x,y.x ≤ y → x ≈ meet x y;
52 lem: ∀x,y.(meet x y) ≤ y
55 interpretation "prelattice meet" 'and a b =
56 (cic:/matita/lattice/meet.con _ a b).
58 lemma feq_ml: ∀ml:prelattice.∀a,b,c:ml. a ≈ b → (c ∧ a) ≈ (c ∧ b).
59 intros (l a b c H); unfold eq in H ⊢ %; unfold Not in H ⊢ %;
60 intro H1; apply H; clear H; apply (strong_extm ???? H1);
63 lemma feq_mr: ∀ml:prelattice.∀a,b,c:ml. a ≈ b → (a ∧ c) ≈ (b ∧ c).
65 apply (Eq≈ ? (meet_comm ???)); apply (Eq≈ ?? (meet_comm ???));
66 apply feq_ml; assumption;
69 lemma prelattice_of_directed: directed → prelattice.
70 intro l_; apply (mk_prelattice (excess_of_directed l_)); [apply (dir_op l_);]
71 unfold excess_of_directed; try unfold apart_of_excess; simplify;
72 unfold excl; simplify;
73 [intro x; intro H; elim H; clear H;
74 [apply (dir_op_refl l_ x);
75 lapply (Ap≫ ? (dir_op_comm ???) t) as H; clear t;
76 lapply (dir_strong_extop l_ ??? H); apply ap_symmetric; assumption
77 | lapply (Ap≪ ? (dir_op_refl ?x) t) as H; clear t;
78 lapply (dir_strong_extop l_ ??? H); apply (dir_op_refl l_ x);
79 apply ap_symmetric; assumption]
80 |intros 3 (x y H); cases H (H1 H2); clear H;
81 [lapply (Ap≪ ? (dir_op_refl ? (dir_op l_ x y)) H1) as H; clear H1;
82 lapply (dir_strong_extop l_ ??? H) as H1; clear H;
83 lapply (Ap≪ ? (dir_op_comm ???) H1); apply (ap_coreflexive ?? Hletin);
84 |lapply (Ap≪ ? (dir_op_refl ? (dir_op l_ y x)) H2) as H; clear H2;
85 lapply (dir_strong_extop l_ ??? H) as H1; clear H;
86 lapply (Ap≪ ? (dir_op_comm ???) H1);apply (ap_coreflexive ?? Hletin);]
87 |intros 4 (x y z H); cases H (H1 H2); clear H;
88 [lapply (Ap≪ ? (dir_op_refl ? (dir_op l_ x (dir_op l_ y z))) H1) as H; clear H1;
89 lapply (dir_strong_extop l_ ??? H) as H1; clear H;
90 lapply (Ap≪ ? (eq_sym ??? (dir_op_assoc ?x y z)) H1) as H; clear H1;
91 apply (ap_coreflexive ?? H);
92 |lapply (Ap≪ ? (dir_op_refl ? (dir_op l_ (dir_op l_ x y) z)) H2) as H; clear H2;
93 lapply (dir_strong_extop l_ ??? H) as H1; clear H;
94 lapply (Ap≪ ? (dir_op_assoc ?x y z) H1) as H; clear H1;
95 apply (ap_coreflexive ?? H);]
96 |intros (x y z H); elim H (H1 H1); clear H;
97 lapply (Ap≪ ? (dir_op_refl ??) H1) as H; clear H1;
98 lapply (dir_strong_extop l_ ??? H) as H1; clear H;
99 lapply (dir_strong_extop l_ ??? H1) as H; clear H1;
100 cases (ap_cotransitive ??? (dir_op l_ y z) H);[left|right|right|left] try assumption;
101 [apply ap_symmetric;apply (Ap≪ ? (dir_op_comm ???));
102 |apply (Ap≫ ? (dir_op_comm ???));
103 |apply ap_symmetric;] assumption;
104 |intros 4 (x y H H1); apply H; clear H; elim H1 (H H);
105 lapply (Ap≪ ? (dir_op_refl ??) H) as H1; clear H;
106 lapply (dir_strong_extop l_ ??? H1) as H; clear H1;[2: apply ap_symmetric]
109 cut (dir_op l_ x y ≈ dir_op l_ x (dir_op l_ y y)) as H1;[2:
110 intro; lapply (dir_strong_extop ???? a); apply (dir_op_refl l_ y);
111 apply ap_symmetric; assumption;]
112 lapply (Ap≪ ? (eq_sym ??? H1) H); apply (dir_op_assoc l_ x y y);
116 record lattice_ : Type ≝ {
117 latt_mcarr:> prelattice;
118 latt_jcarr_: prelattice;
119 latt_with: pl_carr latt_jcarr_ = dual_exc (pl_carr latt_mcarr)
122 lemma latt_jcarr : lattice_ → prelattice.
124 apply (mk_prelattice (dual_exc l)); unfold excess_OF_lattice_;
125 cases (latt_with l); simplify;
126 [apply meet|apply meet_refl|apply meet_comm|apply meet_assoc|
127 apply strong_extm| apply le_to_eqm|apply lem]
130 coercion cic:/matita/lattice/latt_jcarr.con.
132 interpretation "Lattice meet" 'and a b =
133 (cic:/matita/lattice/meet.con (cic:/matita/lattice/latt_mcarr.con _) a b).
135 interpretation "Lattice join" 'or a b =
136 (cic:/matita/lattice/meet.con (cic:/matita/lattice/latt_jcarr.con _) a b).
138 record lattice : Type ≝ {
139 latt_carr:> lattice_;
140 absorbjm: ∀f,g:latt_carr. (f ∨ (f ∧ g)) ≈ f;
141 absorbmj: ∀f,g:latt_carr. (f ∧ (f ∨ g)) ≈ f
144 notation "'meet'" non associative with precedence 50 for @{'meet}.
145 notation "'meet_refl'" non associative with precedence 50 for @{'meet_refl}.
146 notation "'meet_comm'" non associative with precedence 50 for @{'meet_comm}.
147 notation "'meet_assoc'" non associative with precedence 50 for @{'meet_assoc}.
148 notation "'strong_extm'" non associative with precedence 50 for @{'strong_extm}.
149 notation "'le_to_eqm'" non associative with precedence 50 for @{'le_to_eqm}.
150 notation "'lem'" non associative with precedence 50 for @{'lem}.
151 notation "'join'" non associative with precedence 50 for @{'join}.
152 notation "'join_refl'" non associative with precedence 50 for @{'join_refl}.
153 notation "'join_comm'" non associative with precedence 50 for @{'join_comm}.
154 notation "'join_assoc'" non associative with precedence 50 for @{'join_assoc}.
155 notation "'strong_extj'" non associative with precedence 50 for @{'strong_extj}.
156 notation "'le_to_eqj'" non associative with precedence 50 for @{'le_to_eqj}.
157 notation "'lej'" non associative with precedence 50 for @{'lej}.
159 interpretation "Lattice meet" 'meet = (cic:/matita/lattice/meet.con (cic:/matita/lattice/latt_mcarr.con _)).
160 interpretation "Lattice meet_refl" 'meet_refl = (cic:/matita/lattice/meet_refl.con (cic:/matita/lattice/latt_mcarr.con _)).
161 interpretation "Lattice meet_comm" 'meet_comm = (cic:/matita/lattice/meet_comm.con (cic:/matita/lattice/latt_mcarr.con _)).
162 interpretation "Lattice meet_assoc" 'meet_assoc = (cic:/matita/lattice/meet_assoc.con (cic:/matita/lattice/latt_mcarr.con _)).
163 interpretation "Lattice strong_extm" 'strong_extm = (cic:/matita/lattice/strong_extm.con (cic:/matita/lattice/latt_mcarr.con _)).
164 interpretation "Lattice le_to_eqm" 'le_to_eqm = (cic:/matita/lattice/le_to_eqm.con (cic:/matita/lattice/latt_mcarr.con _)).
165 interpretation "Lattice lem" 'lem = (cic:/matita/lattice/lem.con (cic:/matita/lattice/latt_mcarr.con _)).
166 interpretation "Lattice join" 'join = (cic:/matita/lattice/meet.con (cic:/matita/lattice/latt_jcarr.con _)).
167 interpretation "Lattice join_refl" 'join_refl = (cic:/matita/lattice/meet_refl.con (cic:/matita/lattice/latt_jcarr.con _)).
168 interpretation "Lattice join_comm" 'join_comm = (cic:/matita/lattice/meet_comm.con (cic:/matita/lattice/latt_jcarr.con _)).
169 interpretation "Lattice join_assoc" 'join_assoc = (cic:/matita/lattice/meet_assoc.con (cic:/matita/lattice/latt_jcarr.con _)).
170 interpretation "Lattice strong_extm" 'strong_extj = (cic:/matita/lattice/strong_extm.con (cic:/matita/lattice/latt_jcarr.con _)).
171 interpretation "Lattice le_to_eqj" 'le_to_eqj = (cic:/matita/lattice/le_to_eqm.con (cic:/matita/lattice/latt_jcarr.con _)).
172 interpretation "Lattice lej" 'lej = (cic:/matita/lattice/lem.con (cic:/matita/lattice/latt_jcarr.con _)).
174 notation "'feq_jl'" non associative with precedence 50 for @{'feq_jl}.
175 notation "'feq_jr'" non associative with precedence 50 for @{'feq_jr}.
176 interpretation "Lattice feq_jl" 'feq_jl = (cic:/matita/lattice/feq_ml.con (cic:/matita/lattice/latt_jcarr.con _)).
177 interpretation "Lattice feq_jr" 'feq_jr = (cic:/matita/lattice/feq_mr.con (cic:/matita/lattice/latt_jcarr.con _)).
178 notation "'feq_ml'" non associative with precedence 50 for @{'feq_ml}.
179 notation "'feq_mr'" non associative with precedence 50 for @{'feq_mr}.
180 interpretation "Lattice feq_ml" 'feq_ml = (cic:/matita/lattice/feq_ml.con (cic:/matita/lattice/latt_mcarr.con _)).
181 interpretation "Lattice feq_mr" 'feq_mr = (cic:/matita/lattice/feq_mr.con (cic:/matita/lattice/latt_mcarr.con _)).