Neron-Severi group

The Néron-Severi group is a mathematical concept in algebraic geometry, dealing with the properties of algebraic varieties, which are shapes defined by polynomial equations. Specifically, it describes a group of divisors (certain algebraic constructs) on these varieties that help us understand their geometric and topological properties. This group provides crucial insights into how different algebraic surfaces relate to each other, especially in terms of their structures and classifications. Essentially, it helps mathematicians categorize and differentiate these complex shapes, revealing deeper connections in the world of geometry.