On Feb 20, 2010, at 6:00 AM, Jason Grout wrote:
On 02/19/2010 12:45 PM, Robert Bradshaw wrote:
On Feb 19, 2010, at 8:30 AM, Ryan Hinton wrote:
Most classes in Sage have a .parent() method. I'm not a proper
mathematician, so I'm not sure what it really means, but I use it
for
debugging occasionally. :-)
Parents are objects in concrete categories, you can think of them
as the
"sets" an object belongs to, and they store information specific to
that
set and how they relate to other sets.
There has been talk before of getting graphs into the coercion
system, but apparently it hasn't been important enough to anyone to
actually do. Do the combinat people have graphs of some sort in the
coercion system? It seems that they have some sorts of graphs in
their code.
Typically graphs are viewed as objects in the category of graphs,
right? What kind of coercions are people wanting?
- Robert
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