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Algebraic Topology Introduction
Algebraic Topology Introduction

... ti vi ⇒ g(x) = ti f (vi ). This map is linear on the vertex set and is called a simplicial map. In the case that f is a bijection, and a set of vertices forms a simplex in K if and only if the image of the vertices form a simplex in L, then it can be shown that g : |K| → |L| is a homeomorphism, and ...
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... Is the conclusion a result of inductive or deductive reasoning? There is a myth that the Great Wall of China is the only man-made object visible from the Moon. The Great Wall is barely visible in photographs taken from 180 miles above Earth. The Moon is about 237,000 miles from Earth. Therefore, the ...
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Compactness Equivalence and Application to Proper Maps

Geometry. - Cloudfront.net
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... in general, are admirably adapted to determine these duals. Remark: Since our model of the topological group Qp implicitly specifies more information, namely, the subroup Zp , the isomorphisms are canonical. If we only gave the isomorphism class without specifying a compact-open subgroup, the isomor ...
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Geometry 4.2 student copy

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Geometrization conjecture

In mathematics, Thurston's geometrization conjecture states that certain three-dimensional topological spaces each have a unique geometric structure that can be associated with them. It is an analogue of the uniformization theorem for two-dimensional surfaces, which states that every simply-connected Riemann surface can be given one of three geometries (Euclidean, spherical, or hyperbolic).In three dimensions, it is not always possible to assign a single geometry to a whole topological space. Instead, the geometrization conjecture states that every closed 3-manifold can be decomposed in a canonical way into pieces that each have one of eight types of geometric structure. The conjecture was proposed by William Thurston (1982), and implies several other conjectures, such as the Poincaré conjecture and Thurston's elliptization conjecture. Thurston's hyperbolization theorem implies that Haken manifolds satisfy the geometrization conjecture. Thurston announced a proof in the 1980s and since then several complete proofs have appeared in print.Grigori Perelman sketched a proof of the full geometrization conjecture in 2003 using Ricci flow with surgery.There are now several different manuscripts (see below) with details of the proof. The Poincaré conjecture and the spherical space form conjecture are corollaries of the geometrization conjecture, although there are shorter proofs of the former that do not lead to the geometrization conjecture.
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