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Title:Syzygies and implicitization of tensor product surfaces
Author(s):Duarte Gelvez, Eliana Maria
Director of Research:Schenck, Henry
Doctoral Committee Chair(s):Nevins, Thomas
Doctoral Committee Member(s):Francis, George; Reznick, Bruce
Department / Program:Mathematics
Discipline:Mathematics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Implicitization
Syzygy
Rees algebras
Basepoints
Tensor product surface
Smooth quadric
Abstract:A tensor product surface is the closure of the image of a rational map λ : P1 ×P1-->P3. These surfaces arise in geometric modeling and in this context it is useful to know the implicit equation of λ in P3. Currently, syzygies and Rees algebras provide the fastest and most versatile method to find implicit equations of parameterized surfaces. Knowing the structure of the syzygies of the polynomials that define the map λ allows us to formulate faster algorithms for implicitization of these surfaces and also to understand their singularities. We show that for tensor product surfaces without basepoints, the existence of a linear syzygy imposes strong conditions on the structure of the syzygies that determine the implicit equation. For tensor product surfaces with basepoints we show that the syzygies that determine the implicit equation of λ are closely related to the geometry of the set of points at which λ is undefined.
Issue Date:2017-04-10
Type:Thesis
URI:http://hdl.handle.net/2142/97285
Rights Information:Copyright 2017 Eliana Duarte
Date Available in IDEALS:2017-08-10
Date Deposited:2017-05


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