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https://doi.org/10.1007/s11424-010-7221-y
Title: | Proper reparametrization for inherently improper unirational varieties | Authors: | Shen, L. Chionh, E. Gao, X.-S. Li, J. |
Keywords: | BKK bound chow form improper lattice supports improper rational parametrizations reparametrization support transformation |
Issue Date: | 2011 | Citation: | Shen, L., Chionh, E., Gao, X.-S., Li, J. (2011). Proper reparametrization for inherently improper unirational varieties. Journal of Systems Science and Complexity 24 (2) : 367-380. ScholarBank@NUS Repository. https://doi.org/10.1007/s11424-010-7221-y | Abstract: | In this paper, a class of lattice supports in the lattice space Z m is found to be inherently improper because any rational parametrization from C m to C n defined on such a support is improper. The improper index for such a lattice support is defined to be the gcd of the normalized volumes of all the simplex sub-supports. The structure of an improper support S is analyzed and shrinking transformations are constructed to transform S to a proper one. For a generic rational parametrization RP defined on an improper support S, we prove that its improper index is the improper index of S and give a proper reparametrization algorithm for RP. Finally, properties for rational parametrizations defined on an improper support and with numerical coefficients are also considered. © 2011 Institute of Systems Science, Academy of Mathematics and Systems Science, CAS and Springer-Verlag Berlin Heidelberg. | Source Title: | Journal of Systems Science and Complexity | URI: | http://scholarbank.nus.edu.sg/handle/10635/39659 | ISSN: | 10096124 | DOI: | 10.1007/s11424-010-7221-y |
Appears in Collections: | Staff Publications |
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