Linear precision for parametric patches

Details Linear precision for parametric patches Linear precision for parametric patches

2007-06-14

arxiv.org/abs/0706.2116v3

Mathematics

Algebraic Geometry

21 pages, 5 figures

Scientific paper

We give a precise mathematical formulation for the notions of a parametric patch and linear precision, and establish their elementary properties. We relate linear precision to the geometry of a particular linear projection, giving necessary (and quite restrictive) conditions for a patch to possess linear precision. A main focus is on linear precision for Krasauskas' toric patches, which we show is equivalent to a certain rational map on CP^d being a birational isomorphism. Lastly, we establish the connection between linear presision for toric surface patches and maximum likelihood degree for discrete exponential families in algebraic statistics, and show how iterative proportional fitting may be used to compute toric patches.

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