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In mathematics — specifically, in complex analysis — the Berezin transform is an integral operator acting on functions defined on the open unit disk D of the complex plane C. Formally, for a function ƒ : D → C, the Berezin transform of ƒ is a new function Bƒ : D → C defined at a point z ∈ D by
where w denotes the complex conjugate of w and d A {\displaystyle \mathrm {d} A} is the area measure. It is named after Felix Alexandrovich Berezin.
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