new method "elim_to_cases" provides ad-hoc conversion of obtain-style
elimination goals to a disjunction of existentials.
\input{base.tex}
\input{prelim.tex}
\input{logic.tex}
\input{tactic.tex}
\input{proof.tex}
\input{isar.tex}
\input{locale.tex}
\input{integration.tex}
\input{ML.tex}
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