helm/matita/library/datatypes/constructors.ma

   1 (**************************************************************************)
   2 (*       ___                                                                *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||       A.Asperti, C.Sacerdoti Coen,                          *)
   8 (*      ||A||       E.Tassi, S.Zacchiroli                                 *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU Lesser General Public License Version 2.1         *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 set "baseuri" "cic:/matita/datatypes/constructors/".
  16
  17 inductive void : Set \def.
  18
  19 inductive Prod (A,B:Set) : Set \def
  20 pair : A \to B \to Prod A B.
  21
  22 inductive Sum (A,B:Set) : Set \def
  23   inl : A \to Sum A B
  24 | inr : B \to Sum A B.