proper support for "isabelle update -D DIR": avoid accidental exclusion of select_dirs (amending e5dafe9e120f);
chapter Misc
session Cube = Pure +
description "
Author: Tobias Nipkow
Copyright 1992 University of Cambridge
Barendregt's Lambda-Cube.
NB: the formalization is not completely sound! It does not enforce
distinctness of variable names in contexts!
For more information about the Lambda-Cube, see H. Barendregt, Introduction
to Generalised Type Systems, J. Functional Programming.
"
theories Example