What is a punctured disk? I am reading Voisin Book (Hodge Theory and Complex Algebraic Geometry) and I found this term and I would like to know what is it. Thank you!!
2026-03-26 08:14:35.1774512875
What is a Punctured disk?
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It just means a disk minus a point (or the disk minus the point). Most often this means $\{(x,y)\in \Bbb R^2:0<x^2+y^2\le 1\}$, but occasionally people mean the open disk $\{(x,y)\in \Bbb R^2:0<x^2+y^2<1\}$