matita/matita/lib/hott/types.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||         The HELM team.                                      *)
   8 (*      ||A||         http://helm.cs.unibo.it                             *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 include "pts.ma".
  16
  17 record Exists (A: Type[0]) (P: A → Type[0]) : Type[0] ≝ {
  18  pr1: A;
  19  pr2: P pr1
  20 }.
  21
  22 interpretation "Exists" 'exists x = (Exists ? x).
  23 interpretation "mk_Exists" 'mk_exists w p = (mk_Exists ?? w p).