Hi Christian,
Thanks, but now I get another conflict (I am running sage-4.7.2.alpha3):
applying trac_9534-permgroup_base.patch
applying trac_11003.patch
applying trac_11003-review-nt.patch
applying trac_8-finite_enumset_list_cache-fh.patch
applying trac_8-finite_enumset_list_cache-r
I am now reading Chapter I of Lando and Zvonkin so I have a much
better
idea of your interests. I allow boundary points which I have not seen;
but you did mention partial permutations. I will have a look at your
code
and see if I can figure out what you have implemented.
On Oct 3, 8:41 pm, Vincent
The only way "my" ribbon graphs differ from rotation systems is that
rotation systems are closed ribbon graphs. I would also have boundary
points where the involution is not defined. Then I have implemented
a "cobordism category" of such things.
On Oct 3, 9:04 pm, Tom Boothby wrote:
> Bruce,
>
>
