Is there a way to compute the secondary (GKZ) fan with sage?
I am doing research in Toric varieties and I am hoping for a quick way to look at examples.
Looking through "Rational Polyhedral Fans" and "Toric Varieties" pages there is a lot of information that can be calculated about fans/toric varieties but I have not found code to calculate the secondary fan.
I am looking for a simple way to do this either given a Toric variety (or its fan), or from starting from the set of β's, as described in Chapter 14 of "Toric Varieties" by Cox, Little, Schenck.
Does anyone know if Sage has anyway to do this?
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