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- The unit disk is a concept in mathematics, particularly in complex analysis. It is defined as:
- In the complex plane, the unit disk Δ is the set of complex numbers z such that |z| < 11.
- The unit circle ∂Δ is the boundary of the unit disk, consisting of complex numbers with |z| = 11.
- The Poisson equation on a unit disk with zero Dirichlet boundary condition can be written as -Δu = 1 in Ω, where Ω is the unit disk2.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.The unit disk in the complex plane, denoted Δ Δ, is defined as {z ∈C:|z| <1} { z ∈ ℂ: | z | < 1 }. The unit circle, denoted ∂Δ ∂ Δ or S1 S 1 is the boundary {z∈ C:|z|= 1} { z ∈ ℂ: | z | = 1 } of the unit disk Δ Δ. Every element z∈ ∂Δ z ∈ ∂ Δ can be written as z =eiθ z = e i θ for some real value of θ θ.planetmath.org/UnitDiskThe Poisson equation on a unit disk with zero Dirichlet boundary condition can be written as - Δ u = 1 in Ω, u = 0 on δ Ω, where Ω is the unit disk. The exact solution is u (x, y) = 1 - x 2 - y 2 4.www.mathworks.com/help/pde/ug/solve-poissons-e… - People also ask
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Unit disk - Wikipedia
In mathematics, the open unit disk (or disc) around P (where P is a given point in the plane), is the set of points whose distance from P is less than 1: $${\displaystyle D_{1}(P)=\{Q:\vert P-Q\vert <1\}.\,}$$The closed unit disk around P is the set of points whose distance from P is less than or equal to one: See more
The open unit disk forms the set of points for the Poincaré disk model of the hyperbolic plane. Circular arcs perpendicular to the unit circle form the "lines" in this model. … See more
One also considers unit disks with respect to other metrics. For instance, with the taxicab metric and the Chebyshev metric disks look like squares (even though the underlying See more
• Weisstein, Eric W. "Unit disk". MathWorld.
• On the Perimeter and Area of the Unit Disc, by J.C. Álvarez Pavia and A.C. Thompson See moreWikipedia text under CC-BY-SA license Unit Disk -- from Wolfram MathWorld
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Disk (mathematics) - Wikipedia
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Unit circle - Wikipedia
WEBIn mathematics, a unit circle is a circle of unit radius —that is, a radius of 1. [1] Frequently, especially in trigonometry, the unit circle is the circle of radius 1 centered at the origin (0, 0) in the Cartesian coordinate system …
unit disc - PlanetMath.org
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