[isabelle] Isabelle2021-RC6 available for applications

Dear Isabelle users,

the end of the Isabelle2021 release process was originally planned for
tomorrow (15-Feb-2021), but I will be on travel for approx. 1 week. The final
version will presumably be published towards the end of the week.

So here is some very last release candidate

See again
and 4 for further details.

The main change: more examples and more documentation for Isabelle/Naproche:
it is like a formal version of LaTeX with every block of a statement or proof
checked by E Prover (similar to Sledgehammer).

Any feedback about release candidates should be posted with a meaningful
Subject including the version (not just a clone of this announcement).

People who have tested earlier release candidates should definitely follow
this one, otherwise some last-minute problems might remain undetected.


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