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\begin{isabelle}%
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9673
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\isacommand{lemma}\ {\isachardoublequote}{\isacharparenleft}let\ xs\ {\isacharequal}\ {\isacharbrackleft}{\isacharbrackright}\ in\ xs{\isacharat}ys{\isacharat}xs{\isacharparenright}\ {\isacharequal}\ ys{\isachardoublequote}\isanewline
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\isacommand{by}{\isacharparenleft}simp\ add{\isacharcolon}\ Let{\isacharunderscore}def{\isacharparenright}%
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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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8771
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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}\ {\isacharbrackleft}simp{\isacharbrackright}\ {\isacharequal}\ Let{\isacharunderscore}def\end{isabelle}%
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9145
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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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