just one Presentation.State for all sessions: avoid duplication of already presented theories (very slow) and cached theory export (not very slow);
chapter CCL
session CCL = Pure +
description "
Author: Martin Coen, Cambridge University Computer Laboratory
Copyright 1993 University of Cambridge
Classical Computational Logic based on First-Order Logic.
A computational logic for an untyped functional language with
evaluation to weak head-normal form.
"
sessions
FOL
directories "ex"
theories
Wfd
Fix
(* Examples for Classical Computational Logic *)
"ex/Nat"
"ex/List"
"ex/Stream"
"ex/Flag"