Divisor package for Macaulay2

TL;DR

The paper introduces a Macaulay2 package that provides tools for handling divisors, including group operations, conversions, and condition checks, facilitating algebraic geometry computations.

Contribution

It presents a new Macaulay2 package with comprehensive methods for divisors, enhancing computational capabilities in algebraic geometry.

Findings

Includes group operations for divisors

Provides methods for converting divisors to sheaves

Enables checking various divisor properties

Abstract

This note describes a Macaulay2 package for handling divisors. Group operations for divisors are included. There are methods for converting divisors to reflexive or invertible sheaves. Additionally, there are methods for checking whether divisors are Cartier, $Q$-Cartier, simple normal crossings, generate base point free linear systems, or satisfy numerous other conditions.