Computing images of polynomial maps
Corey Harris, Mateusz Michałek, and Emre Sertöz
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Submission date: 04. Jan. 2018
MSC-Numbers: 14Q15, 68U05, 15A69
Keywords and phrases: image of an algebraic variety, matrix product state
Link to arXiv:See the arXiv entry of this preprint.
The image of a polynomial map is a constructible set. While computing its closure is standard in computer algebra systems, a procedure for computing the constructible set itself is not. We provide a new algorithm, based on algebro-geometric techniques, addressing this problem. We also apply these methods to answer a question of W. Hackbusch on the non-closedness of site-independent cyclic matrix product states for infinitely many parameters.