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Our discussion applies to Maple 13. For us, the most important part of Maple is the Groebner package, though there is also the PolynomialIdeals package that will be discussed later in the section. To have access to the commands in the Groebner package, type: > with(Groebner) (here, > is the Maple prompt). Once the Groebner package is loaded, you can perform(More)
This paper will introduce the homogeneous coordinate ring S of a toric variety X. The ring S is a polynomial ring with one variable for each one-dimensional cone in the fan ∆ determining X, and S has a natural grading determined by the monoid of effective divisor classes in the Chow group A n−1 (X) of X (where n = dim X). Using this graded ring, we will(More)
General Information Since the second edition of Using Algebraic Geometry appeared in 2005, Maple's Groebner package has undergone further revisions and extensions. Hence some of the discussion in the text and some examples are no longer up-to-date. The purposes of this update are to indicate the most important changes, to illustrate some of the increased(More)
Human visual recognition processes are remarkably robust and can function effectively even under highly degraded viewing conditions. Contextual information may play a critical role in such circumstances. Here, we provide neurophysiological evidence that contextual cues can elicit object-specific neural responses, which have hitherto been believed to be(More)
The method of moving planes and moving quadrics can express the implicit equation of a parametric surface as the determinant of a matrix M. The rows of M correspond to moving planes or moving quadrics that follow the parametric surface. Previous papers on the method of moving surfaces have shown that a simple base point has the effect of converting one(More)
These are notes for a lecture given at Ohio University on June 3, 2006. An important topic in commutative algebra is the Rees algebra of an ideal in a commutative ring. The Rees algebra encodes a lot of information about the ideal and corresponds geometrically to a blow-up. One can represent the Rees algebra as the quotient of a polynomial ring by an ideal.(More)