author paulson
Tue, 23 Jan 1996 11:33:46 +0100
changeset 1450 19a256c8086d
parent 1061 8897213195c0
child 1461 6bcb44e4d6e5
permissions -rw-r--r--
Renamed letI to LetI (for consistency)

(*  Title: 	ZF/Let
    ID:         $Id$
    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
    Copyright   1995  University of Cambridge

Let expressions -- borrowed from HOL

open Let;

val [prem] = goalw thy
    [Let_def] "(!!x. x=t ==> P(u(x))) ==> P(let x=t in u(x))";
br (refl RS prem) 1;
qed "LetI";