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Let S be a tensor product parametrized surface in P ; that is, S is given as the image of φ : P × P → P . This paper will show that the use of syzygies in the form of a combination of moving planes and moving quadrics provides a valid method for finding the implicit equation of S when certain base points are present. This work extends the algorithm provided by Cox [Cox, D.A., 2001. Equations of parametric curves and surfaces via syzygies. In: Symbolic Computation: Solving Equations in Algebra, Geometry, and Engineering. Contemporary Mathematics vol. 286, pp. 1-20] for when φ has no base points, and it is analogous to some of the results of Busé et al. [Busé, L., Cox, D., D'Andrea, C., 2003. Implicitization of surfaces in P in the presence of base points. J. Algebra Appl. 2 (2), 189-214] for the case of a triangular parametrization φ : P → P with base points. © 2004 Elsevier Ltd. All rights reserved. 3 1 1 3 3 2 3

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Journal of Symbolic Computation

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