> I could also imagine to have three layers: 
> 
> * a core distribution with absolutely minimal dependencies and only 
dependencies which have proved stable on all supported platforms 
> 
> This is exactly sagemath-categories. It has absolutely minimal 
dependencies. 

Would it make sense to give this a different name like Dima's 
suggestion of sagemath-core or something else like sagemath-base, 
sagemath-minimal etc?


I think all of these options are much less expressive than the current 
choice.

Anything named *-minimal* could describe pretty much any arbitrary choice. 
(It's "minimal" for *what*?)
Likewise *-core* could mean pretty much anything. There are many other 
things that are arguably the "core" of Sage.
And *sagemath-categories* is definitely not the *-base*; below it in the 
dependency graph there is sagemath-objects (an even smaller subset).


Thank you for clarifying the intention.  I would never have guessed this 
meaning from the name `sagemath-categories`.  I think that 
`sagemath--minimal-dependencies` would be clear, wouldn't it?

I have now two more questions:

* why are some classes without any dependencies missing from what's 
currently named `sagemath-categories`?  I don't know how to do a systematic 
search, so I only checked the ones I know well, and `GrowthDiagram` is not 
there, but is pure python. 

* wouldn't it be better to tag dependencies, rather than having to 
explicitly put something into what's currently `sagemath-categories`?  I 
imagine that it will be a constant source of confusion whether to put some 
new functionality into all.py or all__sagemath_categories.py

Best wishes,

Martin

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