[isabelle-dev] NEWS: GCD and Binomial in Main

Florian Haftmann florian.haftmann at informatik.tu-muenchen.de
Tue Apr 25 10:58:41 CEST 2017

> * Theories "GCD" and "Binomial" are already included in "Main" (instead
> of "Complex_Main").
> This refers to Isabelle/f533820e7248: the change came up while exploring
> theory imports systematically. Normally, only "Main" or "Complex_Main"
> should be imported from the HOL session, not anything in between. (This
> is a concession to the complex bootstrap process of HOL.)
> In Isabelle/85ed070017b7 Florian has already improved the imports of GCD
> further.
> Are there good ideas how to do it with Binomial? Thus we could get rid
> of the Pre_Main theory from f533820e7248.

The import could be changed e.g. to Groups_List.

Desirable would also be to split the theory into Factorial and Binomial,
to raise awareness of existing combinatorial material in HOL.

As an aside, maybe someone is eager to take the comment

> (*TODO: This code equation breaks Scala code generation in HOL-Codegenerator_Test. We have to figure out why and how to prevent that. *)




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