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Compatibility of Proof General
==============================
This version of Proof General has been tested with these Emacs versions
on Linux:
Emacs 22.1.1 -- recommended and supported
Emacs 21.4.1 -- tested; poorer X-Symbol sub/superscript support
XEmacs 21.5 (beta28) -- tested; PG has workarounds for several bugs
XEmacs 21.4.XX -- tested
and (main) prover versions:
Coq 8.0, 8.1
Isabelle2005, Isabelle2007
Maintaining compatibility across proof assistant versions, Emacs
versions and operating systems is a big challenge! Please visit this
wiki page to check on others experience and report your own:
http://proofgeneral.inf.ed.ac.uk/wiki/Main/PGEmacsCompatibility
Unfortunately it's too difficult to maintain backward compatibility.
Some old version compatibility has been removed here, specifically
affecting:
Coq 7
Isabelle 2004
Earlier buggy versions of GNU Emacs 21
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