src/Cube/ROOT

purge hidden nodes more thoroughly: is_hidden may become true only later;

chapter Cube

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