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Date: 13-6-2021
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An -dimensional open disk of radius is the collection of points of distance less than from a fixed point in Euclidean -space. Krantz (1999, p. 3) uses the symbol to denote the open disk, and to denote the unit open disk centered at the origin.
The open disk for is called an open interval, and the term open ball is often used for .
REFERENCES:
Krantz, S. G. Handbook of Complex Variables. Boston, MA: Birkhäuser, p. 3, 1999.
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