Jumping Numbers of a Simple Complete Ideal in a Two-Dimensional Regular Local Ring
Jumping Numbers of a Simple Complete Ideal in a Two-Dimensional Regular Local Ring by Tarmo Jarvilehto
English | 2011 | ISBN: 0821848119 | 78 Pages | PDF | 689.59 KB
English | 2011 | ISBN: 0821848119 | 78 Pages | PDF | 689.59 KB
The multiplier ideals of an ideal in a regular local ring form a family of ideals parameterized by non-negative rational numbers. As the rational number increases the corresponding multiplier ideal remains unchanged until at some point it gets strictly smaller. A rational number where this kind of diminishing occurs is called a jumping number of the ideal. In this manuscript the author gives an explicit formula for the jumping numbers of a simple complete ideal in a two-dimensional regular local ring. In particular, he obtains a formula for the jumping numbers of an analytically irreducible plane curve. He then shows that the jumping numbers determine the equisingularity class of the curve.