Regularity is a concept that captures the idea of smoothness and well-behaved structures in algebraic geometry, particularly focusing on the properties of varieties and sheaves. It often describes how closely a geometric object resembles a 'nice' or 'regular' one, which can greatly impact the application of various theorems like Serre duality and the Riemann-Roch theorem, as well as the classification of varieties as normal or Cohen-Macaulay. Understanding regularity helps in assessing both geometric and algebraic properties that are essential for deeper studies in this field.
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