= Annulus theorem
{wiki=Annulus_theorem}
The Annulus theorem is a concept in mathematics, particularly in complex analysis and number theory. While the term "Annulus theorem" could refer to different results depending on the context, one notable application relates to properties of holomorphic functions defined on annular regions in the complex plane. In general, an annulus is a ring-shaped region defined as the set of points in the plane that are between two concentric circles.
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