Dear Javier, William, David K.
On Mon, Oct 26, 2009 at 09:57:25AM -0700, javier wrote:
> Postive review for monoid_algebras.py
Thanks! 7 categories left and down!
> algebra_modules.py should be instructed to work only for commutative
> algebras (and mentioned in the description) as we talked in a former
> thread.
Will do. Can I set positive review once this is done?
> I have also checked groupoid.py as it requested a second opinion,
> and find it extremely confusing. What is supposed to mean "groupoids
> for a set (usually a group)"?
>
> Firstly, the function should be called "Groupoids" unless we are only
> constructing one.
>
> If by "over a set X" we mean groupoids with set of objects X, it makes
> no sense the "usually a group" part. When a group is defined as a
> groupoid, it has only one object, whilst the elements of the group are
> realized as arrows. If we mean that X is the set of arrows then it
> should be specified, and personally I find that defining a groupoid by
> the set of arrows is a terrible idea. What are the expected uses of
> this category?
>
> IMHO, it would make more sense to describe small groupoids as
> (directed) (multi)graphs, with underlying set the set of vertices (and
> not the set of arrows). Can anyone elaborate on how are we going to
> use this construction later on?
William, David: I ported this category straight away from the original
one in Sage, and it confused me as well for the same reasons. What was
the intention?
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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