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;; Processing Unicode Files with ACL2
;; Copyright (C) 2005-2006 by Jared Davis <jared@cs.utexas.edu>
;;
;; This program is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by the Free
;; Software Foundation; either version 2 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 General Public License along with
;; this program; if not, write to the Free Software Foundation, Inc., 59 Temple
;; Place - Suite 330, Boston, MA 02111-1307, USA.
(in-package "ACL2")
(local (include-book "revappend"))
(local (include-book "coerce"))
(defthm stringp-of-reverse
(equal (stringp (reverse x))
(stringp x)))
(defthm true-listp-of-reverse
(equal (true-listp (reverse x))
(not (stringp x))))
(defthm equal-of-reverses-when-strings
(implies (and (stringp x)
(stringp y))
(equal (equal (reverse x) (reverse y))
(equal x y))))
(defthm equal-of-reverses-when-lists
(implies (and (true-listp x)
(true-listp y))
(equal (equal (reverse x) (reverse y))
(equal x y))))
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