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polydisc In the theory of functions of several complex variables, a branch of mathematics, a polydisc is a Cartesian product of discs. More specifically, if we denote by the open disc of center ''z'' and radius ''r'' in the complex plane, then an open polydisc is a set of the form : It can be equivalently written as : One should not confuse the polydisc with the open ball in Cn, which is defined as : 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「polydisc」の詳細全文を読む
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