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Combinatorial maps?

asked 2019-03-03 13:40:17 +0200

anonymous user


updated 2019-03-03 13:44:57 +0200

Does sagemath natively support “combinatorial maps”, as defined for instance on wikipedia?

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See also

sage: graphs.RandomTriangulation?


sage: graphs.RandomBicubicPlanar?
FrédéricC gravatar imageFrédéricC ( 2019-03-03 16:25:13 +0200 )edit

But these are instances of _graphs_, so no orientation information, no?

debiais gravatar imagedebiais ( 2019-03-03 16:28:37 +0200 )edit

They do contain orientation information.

FrédéricC gravatar imageFrédéricC ( 2019-03-03 21:40:06 +0200 )edit

Noted, thanks! I'll have a look

debiais gravatar imagedebiais ( 2019-03-04 06:05:46 +0200 )edit

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answered 2019-03-03 13:48:51 +0200

vdelecroix gravatar image

Sort of, you can look at RibbonGraph. Though this class does not have a lot of features yet.

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Good thanks! I wouldn't have know from the name only that they are the same as combinatorial maps. By “yet”, do you mean there is activity in making the class more featureful?

debiais gravatar imagedebiais ( 2019-03-03 15:11:37 +0200 )edit

Indeed, there are many synonyms: "fat graphs", "ribbon graphs", "combinatorial maps", "embedded graphs", ... I don't mean there is activity right now, but several people expressed their wishes to provide more code for this in Sage (in particular regarding exhaustive or random generation). Also, there are many related modules around such as flipper.

vdelecroix gravatar imagevdelecroix ( 2019-03-03 17:02:52 +0200 )edit

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Asked: 2019-03-03 13:40:17 +0200

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Last updated: Mar 03 '19