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.
Thanks,
Jason
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