[isabelle-dev] Set_Algebras: Overloading + on 'a set (again)

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Wed Jan 4 21:13:24 CET 2012

> Here is another change to be considered in the project of 'a set recovery:
> changeset:   26814:b3e8d5ec721d
> user:        berghofe
> date:        Wed May 07 10:59:24 2008 +0200
> files:       src/HOL/Library/BigO.thy
> src/HOL/Library/SetsAndFunctions.thy src/HOL/MetisExamples/BigO.thy
> description:
> Replaced + and * on sets by \<oplus> and \<otimes>, to avoid clash with
> definitions of + and * on functions.
> This is a result from inspection of "hg log -u berghofe -r
> Isabelle2007:Isabelle2008".  I have already reverted a few more obvious
> things in c296c75f4cf4.

This indeed is what is mentioned as »backport theory Set_Algebras to
type classes« on the list open issues.




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