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