An excursion from enumerative goemetry to solving systems of polynomial equations with Macaulay 2

Details An excursion from enumerative goemetry to solving systems of polynomial equations with Macaulay 2 An excursion from enumerative goemetry to solving systems of polynomial equations with Macaulay 2

2000-07-24

arxiv.org/abs/math/0007142v2

Computations in Algebraic Geometry with Macaulay 2, edited by D. Eisenbud, D. Grayson, M. Stillman, and B. Sturmfels. ACM 8, S

Mathematics

Algebraic Geometry

LaTeX 2e, 22 pages, 1 .eps figure. Source file (.tar.gz) includes Macaulay 2 code in article, as well as Macaulay 2 package re

Scientific paper

Solving a system of polynomial equations is a ubiquitous problem in the applications of mathematics. Until recently, it has been hopeless to find explicit solutions to such systems, and mathematics has instead developed deep and powerful theories about the solutions to polynomial equations. Enumerative Geometry is concerned with counting the number of solutions when the polynomials come from a geometric situation and Intersection Theory gives methods to accomplish the enumeration. We use Macaulay 2 to investigate some problems from enumerative geometry, illustrating some applications of symbolic computation to this important problem of solving systems of polynomial equations. Besides enumerating solutions to the resulting polynomial systems, which include overdetermined, deficient, and improper systems, we address the important question of real solutions to these geometric problems. The text contains evaluated Macaulay 2 code to illuminate the discussion. This is a chapter in the forthcoming book "Computations in Algebraic Geometry with Macaulay 2", edited by D. Eisenbud, D. Grayson, M. Stillman, and B. Sturmfels. While this chapter is largely expository, the results in the last section concerning lines tangent to quadrics are new.

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