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Manifold (fluid mechanics) - Wikipedia
A manifold is a wider and/or larger pipe or channel, into which smaller pipes or channels lead, [1] or a pipe fitting or similar device that connects multiple …
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Manifold - Simple English Wikipedia, the free encyclopedia
In a small triangle on the face of the earth, the sum of the angles is almost 180°. A sphere can be represented by several two dimensional maps, therefore a sphere is a manifold. A manifold is a concept from mathematics. Making a manifold is like making a flat map of a sphere (the Earth).
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History of manifolds and varieties - Wikipedia
- The term "manifold" comes from German Mannigfaltigkeit, by Bernhard Riemann. In English, "manifold" refers to spaces with a differentiable or topological structure, while "variety" refers to spaces with an algebraic structure, as in algebraic varieties. In Romance languages, manifold is translated as "variety" – such spaces with a differentiable st...
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Pseudo-Riemannian manifold - Wikipedia
In mathematical physics, a pseudo-Riemannian manifold, [1] [2] also called a semi-Riemannian manifold, is a differentiable manifold with a metric tensor that is everywhere nondegenerate. This is a generalization of a Riemannian manifold in which the requirement of positive-definiteness …
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Calabi–Yau manifold - Wikipedia
A 2D slice of a 6D Calabi–Yau quintic manifold. In algebraic and differential geometry, a Calabi–Yau manifold, also known as a Calabi–Yau space, is a particular type of manifold which has certain properties, such as Ricci flatness, …
Stochastic analysis on manifolds - Wikipedia
In mathematics, stochastic analysis on manifolds or stochastic differential geometry is the study of stochastic analysis over smooth manifolds.It is therefore a synthesis of stochastic analysis (the extension of calculus to stochastic processes) and of differential geometry.. The connection …
3-manifold - Wikipedia
A Haken manifold is a compact, P²-irreducible 3-manifold that is sufficiently large, meaning that it contains a properly embedded two-sided incompressible surface. Sometimes one considers only orientable Haken manifolds, in which case a Haken manifold is a compact, orientable, …
(G, X)-manifold - Wikipedia
In geometry, if X is a manifold with an action of a topological group G by analytical diffeomorphisms, the notion of a (G, X)-structure on a topological space is a way to formalise it being locally isomorphic to X with its G -invariant structure; spaces with a (G, X)-structure are …
Atlas (topology) - Wikipedia
An atlas for a topological space is an indexed family {(,):} of charts on which covers (that is, =).If for some fixed n, the image of each chart is an open subset of n-dimensional Euclidean space, then is said to be an n-dimensional manifold.. The plural of atlas is atlases, although some …
Manifold - Encyclopedia of Mathematics
Jun 6, 2020 · In mathematics, manifolds arose first of all as sets of solutions of non-degenerate systems of equations and also as various sets of geometric and other objects allowing local parametrization (see below); for example, the set of planes of dimension $ k $ in $ \mathbf R ^ …
Klein bottle - Wikipedia
A two-dimensional representation of the Klein bottle immersed in three-dimensional space. In mathematics, the Klein bottle (/ ˈ k l aɪ n /) is an example of a non-orientable surface; that is, informally, a one-sided surface which, if traveled upon, could be followed back to the point of …
Feb 23, 2010 · In mathematics, specifically differential geometry, the infinitesimal geometry of Riemannian manifolds with dimension at least 3 is too complicated to be described by a single number at a given point. Riemann introduced an abstract and rigorous way to define it, now …
微分流形 - 维基百科,自由的百科全书
光滑流形 (英語: smooth manifold),或称 C∞-微分流形 (differential manifold)、 C∞-可微流形 (differentiable manifold),是指一个被赋予了光滑结构的 拓扑流形。 一般的,如果不特指, 微分流形 或 可微流形 指的就是 C∞ 类的微分流形。 可微流形在 物理學 中非常重要。 特殊種 …
Definition of manifold - Mathematics Stack Exchange
From Wikipedia: The broadest common definition of manifold is a topological space locally homeomorphic to a topological vector space over the reals. A topological manifold is a topological space locally homeomorphic to a Euclidean space.
Manifold Structures - Manifolds - Stanford University
These classes encode the structure of a manifold. AUTHORS: The structure of a degenerate manifold. Return the subcategory of cat corresponding to the structure of self. EXAMPLES: The structure of a differentiable manifold over a general topological field. Return the subcategory of …
Kähler manifold — Wikipedia Republished // WIKI 2
In mathematics and especially differential geometry, a Kähler manifold is a manifold with three mutually compatible structures: a complex structure, a Riemannian structure, and a symplectic structure. The concept was first studied by Jan Arnoldus Schouten and David van Dantzig in …
Dimensionality and Manifold - Data Science Stack Exchange
May 6, 2015 · Manifold from Wikipedia: In mathematics, a manifold is a topological space that resembles Euclidean space near each point. More precisely, each point of an n-dimensional manifold has a neighbourhood that is homeomorphic to the Euclidean space of dimension n.
manifolds, which is simply a topological manifold where the gluing maps are required to be smooth. First we recall the notion of a smooth map of nite-dimensional vector spaces. Remark 1 (Aside on smooth maps of vector spaces).
triangulation of manifolds - Mathematics Stack Exchange
Apr 28, 2017 · A manifold with a triangulation is called a piecewise-linear manifold. To quote wikipedia's article on PL manifolds: "The obstruction to placing a PL structure on a topological manifold is the Kirby-Siebenmann class.
流形 - 维基百科,自由的百科全书
流形的英語manifold 以及德語Mannigfaltigkeit原字義解作「很多、不同」的意思,這與漢語傳統中流形一詞的字義相同。 例如13世紀 南宋 《 正氣歌 》中「天地有正氣,雜然賦流形:下則為河嶽,上則為日星」一句中的 流形 ,就是指正氣有如山河日星等等「很多」 ...
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