ASKSAGE: Sage Q&A Forum - RSS feedhttps://ask.sagemath.org/questions/Q&A Forum for SageenCopyright Sage, 2010. Some rights reserved under creative commons license.Sun, 15 Jan 2017 22:55:25 +0100Can the star of a ray of a fan be computed in sage?https://ask.sagemath.org/question/36303/can-the-star-of-a-ray-of-a-fan-be-computed-in-sage/Let `p` be a ray of a fan `F` in a lattice `N`. Let `Np` be the quotient lattice `N / N.span(p)`. The *star* of `p` is the fan in `Np` defined by
Star(p) = {bar(sigma) | p <= sigma}
(This definition is taken from Definition 4.4 on page 55 of [this paper](http://algant.eu/documents/theses/gualdi.pdf). Is there an algorithm to compute `Star(p)` in `sage`? If so, what about the embedding morphism `Star(p) --> F`?Sun, 15 Jan 2017 22:55:25 +0100https://ask.sagemath.org/question/36303/can-the-star-of-a-ray-of-a-fan-be-computed-in-sage/