doc-src/TutorialI/Misc/document/let_rewr.tex

fixed deps;

\begin{isabelle}%
\isacommand{lemma}\ {"}(let\ xs\ =\ []\ in\ xs@ys@xs)\ =\ ys{"}\isanewline
\isacommand{by}(simp\ add:\ Let\_def)%
\begin{isamarkuptext}%
If, in a particular context, there is no danger of a combinatorial explosion
of nested \isa{let}s one could even add \isa{Let_def} permanently:%
\end{isamarkuptext}%
\isacommand{lemmas}\ [simp]\ =\ Let\_def\end{isabelle}%
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