Pyramids and monomial blowing-ups

Details Pyramids and monomial blowing-ups Pyramids and monomial blowing-ups

2004-09-23

arxiv.org/abs/math/0409446v1

Mathematics

Commutative Algebra

12 pages

Scientific paper

We show that a convex pyramid in R^n with apex at 0 can be brought to the first quadrant by a finite sequence of monomial blowing-ups if and only if its intersection with the opposite of the first quadrant is 0. The proof is non-trivially derived from the theorem of Farkas-Minkowski. Then, we apply this theorem to show how the Newton diagrams of the roots of any Weierstrass polynomial are contained in a pyramid of this type. Finally, if n = 2, this fact is equivalent to the Jung-Abhyankar theorem.

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