added parallel_proofs flag (default true, cf. usedir option -Q), which can be disabled in low-memory situations;
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<h1>HOL/AxClasses</h1>
These are the HOL examples of the tutorial <a
href="http://isabelle.in.tum.de/dist/Isabelle/doc/axclass.pdf">Using Axiomatic Type
Classes in Isabelle</a>. See also FOL/ex/NatClass for the natural
number example.
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