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|Title:||Proper reparametrization for inherently improper unirational varieties||Authors:||Shen, L.
improper lattice supports
improper rational parametrizations
|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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