An -dimensional closed disk of radius is the collection of points of distance from a fixed point in -dimensional Euclidean space. Krantz (1999, p. 3) uses the symbol to denote the closed disk, and to denote the unit closed disk centered at the origin
Closed Disk
See also
Disk, Open DiskExplore with Wolfram|Alpha
References
Krantz, S. G. Handbook of Complex Variables. Boston, MA: Birkhäuser, p. 3, 1999.Referenced on Wolfram|Alpha
Closed DiskCite this as:
Weisstein, Eric W. "Closed Disk." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ClosedDisk.html