• Compactness measure is a numerical quantity representing the degree to which a shape is compact. The circle and the sphere are the most compact planar...
    4 KB (504 words) - 12:03, 18 June 2024
  • analysis, two measures of non-compactness are commonly used; these associate numbers to sets in such a way that compact sets all get the measure 0, and other...
    3 KB (483 words) - 11:40, 20 August 2022
  • roundness A circularity ratio as a compactness measure of a shape An assumption of ANOVAs, with repeated-measures, often called "sphericity" Circular...
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  • The Polsby–Popper test is a mathematical compactness measure of a shape developed to quantify the degree of gerrymandering of political districts. The...
    3 KB (376 words) - 09:00, 19 May 2024
  • Compactness can refer to: Compact space, in topology Compact operator, in functional analysis Compactness theorem, in first-order logic Compactness measure...
    289 bytes (67 words) - 21:13, 10 March 2022
  • Thumbnail for Compact space
    topology, compactness is a property that seeks to generalize the notion of a closed and bounded subset of Euclidean space. The idea is that a compact space...
    45 KB (5,697 words) - 16:35, 12 November 2024
  • analysis: Shape factor (image analysis and microscopy) including: The compactness measure of a shape In statistics: The shape parameter, sometimes referred...
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  • Thumbnail for Sphericity
    can turn without failing. Sphericity is a specific example of a compactness measure of a shape. Sphericity applies in three dimensions; its analogue...
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  • In mathematical analysis, the Haar measure assigns an "invariant volume" to subsets of locally compact topological groups, consequently defining an integral...
    32 KB (5,357 words) - 21:19, 16 October 2024
  • starting point and should be built upon with additional measures, like the compactness measure of a shape to prevent against gerrymandering. Citing in...
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  • property of local compactness, and as such motivated the search for the more general theory, presented here. Any discrete group is locally compact. The theory...
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  • Thumbnail for Compact disc
    patents, and prototypes instigated and in some measure influenced the compact disc's design. The compact disc is an evolution of LaserDisc technology,...
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  • finite on all compact sets, outer regular on all Borel sets, and inner regular on open sets. These conditions guarantee that the measure is "compatible"...
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  • sets and from below by compact measurable sets. Let (X, T) be a topological space and let Σ be a σ-algebra on X. Let μ be a measure on (X, Σ). A measurable...
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  • circle and goes down as far as 0 for highly non-circular shapes. Compactness measure of a shape Eccentricity (mathematics), how much a conic section (e...
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  • American political scientist Polsby–Popper test, a mathematical compactness measure This page lists people with the surname Polsby. If an internal link...
    283 bytes (74 words) - 01:51, 27 December 2020
  • Prokhorov's theorem (category Compactness theorems)
    In measure theory Prokhorov's theorem relates tightness of measures to relative compactness (and hence weak convergence) in the space of probability measures...
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  • Thumbnail for Surface-area-to-volume ratio
    all other known rocky bodies) so that their heat loss is minimal. Compactness measure of a shape Dust explosion Square–cube law Specific surface area Schmidt-Nielsen...
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  • homeomorphism) locally compact Hausdorff space X. This is shown using the Gelfand representation. The notion of local compactness is important in the study...
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  • Thumbnail for Measure (mathematics)
    include: Borel measure, Jordan measure, ergodic measure, Gaussian measure, Baire measure, Radon measure, Young measure, and Loeb measure. In physics an...
    35 KB (5,554 words) - 21:47, 26 October 2024
  • Radon–Nikodym derivative, or density, of a measure. We have the following chains of inclusions for functions over a compact subset of the real line: absolutely...
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  • counting measure is σ -finite. Locally compact groups which are σ-compact are σ-finite under the Haar measure. For example, all connected, locally compact groups...
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  • In measure theory, a branch of mathematics, the Lebesgue measure, named after French mathematician Henri Lebesgue, is the standard way of assigning a...
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  • Thumbnail for Pontryagin duality
    with the Haar measure introduced by John von Neumann, André Weil and others depends on the theory of the dual group of a locally compact abelian group...
    39 KB (5,807 words) - 20:34, 7 November 2024
  • Thumbnail for National Popular Vote Interstate Compact
    outcome, while the intermediary measure of state-level majorities is rendered obsolete. Some opponents of the compact contend that it would lead to a...
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  • require additional restrictions on the measure, as described below. Let X {\displaystyle X} be a locally compact Hausdorff space, and let B ( X ) {\displaystyle...
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  • Thumbnail for Probability measure
    descriptions as a fallback Haar measure – Left-invariant (or right-invariant) measure on locally compact topological group Lebesgue measure – Concept of area in...
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  • greatest possible density. If K1,...,Kn are measurable subsets of a compact measure space X and their interiors pairwise do not intersect, then the collection...
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  • \varepsilon >0} , there is a compact subset K ε {\displaystyle K_{\varepsilon }} of X {\displaystyle X} such that, for all measures μ ∈ M {\displaystyle \mu...
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  • α , {\textstyle \bigcup U_{\alpha },} a simple argument based on the compactness of the support of ϕ {\displaystyle \phi } and a partition of unity shows...
    17 KB (2,662 words) - 12:59, 18 August 2024