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 set "baseuri" "cic:/matita/PREDICATIVE-TOPOLOGY/domain_defs".
19 include "class_defs.ma".
21 (* QUANTIFICATION DOMAINS
22 - These are the categories on which we allow quantification
23 - We set up single quantifiers, parametric on the domain, so they
24 already have the properties that usually are axiomatized inside the
25 domain structure. This makes domains easier to use
28 record Domain: Type \def {
32 (* internal universal quantification *)
33 inductive dall (D:Domain) (P:D \to Prop) : Prop \def
34 | dall_intro: (\forall d:D. cin D d \to P d) \to dall D P.
36 (* internal existential quantification *)
37 inductive dex (D:Domain) (P:D \to Prop) : Prop \def
38 | dex_intro: \forall d:D. cin D d \land P d \to dex D P.
40 (* notations **************************************************************)
42 (*CSC: the URI must disappear: there is a bug now *)
43 interpretation "internal for all" 'iforall \eta.x =
44 (cic:/matita/PREDICATIVE-TOPOLOGY/domain_defs/dall.ind#xpointer(1/1) _ x).
46 notation > "hvbox(\iforall ident i opt (: ty) break . p)"
47 right associative with precedence 20
48 for @{ 'iforall ${default
49 @{\lambda ${ident i} : $ty. $p)}
50 @{\lambda ${ident i} . $p}}}.
52 (*CSC: the URI must disappear: there is a bug now *)
53 interpretation "internal exists" 'dexists \eta.x =
54 (cic:/matita/PREDICATIVE-TOPOLOGY/domain_defs/dex.ind#xpointer(1/1) _ x).
56 notation > "hvbox(\iexists ident i opt (: ty) break . p)"
57 right associative with precedence 20
58 for @{ 'dexists ${default
59 @{\lambda ${ident i} : $ty. $p)}
60 @{\lambda ${ident i} . $p}}}.