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Resolutions of ideals of quasiuniform fat point subschemes of
Authors:Brian Harbourne  Sandeep Holay  Stephanie Fitchett
Institution:Department of Mathematics and Statistics, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0323 ; Department of Mathematics, Southeast Community College, Lincoln, Nebraska 68508 ; Florida Atlantic University, Honors College, Jupiter, Florida 33458
Abstract:The notion of a quasiuniform fat point subscheme $Z\subset\mathbf P^2$is introduced and conjectures for the Hilbert function and minimal free resolution of the ideal $I$ defining $Z$ are put forward. In a large range of cases, it is shown that the Hilbert function conjecture implies the resolution conjecture. In addition, the main result gives the first determination of the resolution of the $m$th symbolic power $I(m;n)$ of an ideal defining $n$ general points of $\mathbf P^2$ when both $m$ and $n$ are large (in particular, for infinitely many $m$ for each of infinitely many $n$, and for infinitely many $n$ for every $m>2$). Resolutions in other cases, such as ``fat points with tails', are also given. Except where an explicit exception is made, all results hold for an arbitrary algebraically closed field $k$. As an incidental result, a bound for the regularity of $I(m;n)$ is given which is often a significant improvement on previously known bounds.

Keywords:Ideal generation conjecture  symbolic powers  resolution  fat points  maximal rank  
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