\chapter{Presenting Theories}
\label{ch:thy-present}
Due to the previous chapters the reader should have become sufficiently
acquainted with elementary theory development in Isabelle/HOL. The following
interlude covers the seemingly ``marginal'' issue of presenting theories in a
typographically pleasing manner. Isabelle provides a rich infrastructure for
concrete syntax of the underlying $\lambda$-calculus language, as well as
document preparation of theory texts based on existing PDF-{\LaTeX}
technology.
As has been pointed out by Leibniz\index{Leibniz, Gottfried Wilhelm} more than
300 years ago, \emph{notions} are in principle more important than
\emph{notations}, but fair textual representation of ideas is vital to reduce
the mental effort in actual applications.
\input{Documents/document/Documents.tex}
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