canonical 'cases'/'induct' rules for n-tuples (n=3..7)
(really belongs to theory Product_Type, but doesn't work there yet)
%FIXME
%\chapter{Basic Concepts}\label{ch:basics}
%\section{The Isar proof language}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: "isar-ref"
%%% End: