This is a package for handling multi-projective varieties, that is, closed subvarieties of products of projective spaces, and rational maps between them. This extends the package Cremona, which treats rational maps from multi-projective varieties to standard projective varieties, $X\subseteq \mathbb{P}^{k_1}\times\mathbb{P}^{k_2}\times\cdots\times\mathbb{P}^{k_n}\dashrightarrow Y\subseteq\mathbb{P}^N$.
Version 2.3 of this package was accepted for publication in volume 11 of The Journal of Software for Algebra and Geometry on 31 August 2021, in the article Computations with rational maps between multi-projective varieties (DOI: 10.2140/jsag.2021.11.143). That version can be obtained from the journal.
This documentation describes version 2.7.1 of MultiprojectiveVarieties.
If you have used this package in your research, please cite it as follows:
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The object MultiprojectiveVarieties is a package, defined in MultiprojectiveVarieties.m2.
The source of this document is in MultiprojectiveVarieties.m2:2443:0.