simplify definition of vector_space locale (use axclasses instead of inheriting from field and ab_group_add classes)
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\begin{isabellebody}%
\def\isabellecontext{base}%
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\isadelimtheory
\isanewline
\isanewline
\isanewline
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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%
%
\endisatagtheory
{\isafoldtheory}%
%
\isadelimtheory
\isanewline
%
\endisadelimtheory
\end{isabellebody}%
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