replaced apply-style proof for instance Multiset :: plus_ac0 by recommended Isar proof style
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<H2>Cube: Barendregt's Lambda-Cube</H2>
This directory contains the ML sources of the Isabelle system for the
Lambda-Cube.<p>
The <tt>ex</tt> subdirectory contains some examples.<p>
NB: the formalization is not completely sound! It does not enforce
distinctness of variable names in contexts!<P>
For more information about the Lambda-Cube, see
<UL>
<LI>H. Barendregt<BR>
Introduction to Generalised Type Systems<BR>
J. Functional Programming
</UL>
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