New unified treatment of sequent calculi by Sara Kalvala
combines the old LK and Modal with the new ILL (Int. Linear Logic)
(* Title: HOLCF/holcfb.thy
ID: $Id$
Author: Franz Regensburger
Copyright 1993 Technische Universitaet Muenchen
Basic definitions for the embedding of LCF into HOL.
*)
Holcfb = Nat +
consts
theleast :: "(nat=>bool)=>nat"
rules
theleast_def "theleast(P) == (@z.(P(z) & (!n.P(n)-->z<=n)))"
end