doc-src/IsarImplementation/Thy/document/Base.tex

fixed bug in the "fast_descrs" optimization;
the bug is that two sets may actually be the same but because of the three-valued logic a different "The" or "Eps" is chosen; e.g. consider the set {1, 2}. If it is approximated in one place as {1, 2?} and in another place as {1?, 2}, then "Eps" would return 1 in the first case and 2 in the second case. This is of course wrong, because both sets potentially represent {1, 2}.
The current fix has a very negative impact on precision.

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\begin{isabellebody}%
\def\isabellecontext{Base}%
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\isadelimtheory
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\endisadelimtheory
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\isatagtheory
\isacommand{theory}\isamarkupfalse%
\ Base\isanewline
\isakeyword{imports}\ Pure\isanewline
\isakeyword{uses}\ {\isachardoublequoteopen}{\isachardot}{\isachardot}{\isacharslash}{\isachardot}{\isachardot}{\isacharslash}antiquote{\isacharunderscore}setup{\isachardot}ML{\isachardoublequoteclose}\isanewline
\isakeyword{begin}\isanewline
\isanewline
\isacommand{end}\isamarkupfalse%
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\endisatagtheory
{\isafoldtheory}%
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\isadelimtheory
\isanewline
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\endisadelimtheory
\end{isabellebody}%
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