[isabelle-dev] NEWS: HOL/Library/Omega_Words_Fun

Makarius makarius at sketis.net
Tue Sep 15 14:17:17 CEST 2015

On Tue, 15 Sep 2015, Peter Lammich wrote:

> * HOL/Library/Omega_Words_Fun: Infinite words modeled as
>  functions nat => 'a.
> This lived hidden in $AFP/Automatic_Refinement before, but other entries
> started to use it. So I moved it to HOL/Library.

This refers to Isabelle/0b071f72f330.  On isabelle-dev postings without 
proper changeset id hardly make any sense.

> (Expecting $AFP/LTL_to_DRA to break until Salomon, who wants to adapt it 
> himself, has fixed it)

This refers to AFP/498eb40c9d9e, where it is so broken that the session 
hierarchy fails utterly.  In other words: total failure of existence. In 
AFP/3085eb9e2bb9, I've formally adjusted the session definitions at least 
-- in much less time than writing this mail.

I guess that it is mostly trivial to adjust the actual theories as well. 
The common practice is that someone who does a change like 0b071f72f330 
above also adjusts all of AFP accordingly, unless there are really big 
problems that need the original author.

The AFP editors have stated a theoretical scheme of maintenance by the 
original authors more than 10 years ago.  If we would have followed that, 
AFP would not be where it is today. Most maintenance happens 


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