Dear Florian,
For the final record:
Concerning \mu and \nu, I am currently investigating whether an import
swap could re-establish the situation known from Isabelle2016-1
see http://isabelle.in.tum.de/repos/isabelle/rev/5a42eddc11c1
I had overlooked that \mu and \nu are global constants when importing
this material, which I had received from Simon Foster. This needs to be
addressed properly.
Your workaround merely helps users of Group, not of Complete_Lattice.
Moreover, it doesn't make sense that Complete_Lattice imports Group, and
that the structure theorem about subgroups is now in lattice theory.
I request you revert this patch.
Clemens
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