Tropical Geometry

asked 2 years ago

lijr07 gravatar image

updated 2 years ago

FrédéricC gravatar image

I would like to define a fan in SageMath using piecewise linear functions and compute its facets vertices edges and so on. For example, let P be the fan defined by

w1i=w23=0,i=2,3,3,5, w24=min(0,x1),w25=min(0,x1,x1+x2), w34=x1, w35=min(x1,x1+x2), w45=x1+x2.

It is a fan similar to the fan on page 11 of https://arxiv.org/pdf/math/0312297.pdf.

How to define the fan and compute its f-vector in SageMath? Thank you very much.

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