Lecture

Plane Curves: Singular Points and Multiplicities

Description

This lecture delves into the study of plane curves, focusing on singular points and multiplicities. The instructor explains the concept of simple points, where the Jacobian matrix must have full rank, leading to the definition of non-singular curves. The lecture covers examples of non-singular and singular points, introducing the notion of multiplicity at a point. It explores the factorization of the lowest term of a polynomial and the tangent lines to a curve at a singular point. The discussion extends to multiple points, such as double and triple points, and the classification of ordinary multiple points like nodes. The lecture concludes with an intrinsic definition of multiplicity using local rings and maximal ideals, providing a deeper understanding of the concept.

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