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This illustrates that a coffee mug and a donut are homeomorphic. In mathematics and more specifically in topology , a homeomorphism ( from Greek roots meaning "similar shape", named by Henri Poincaré ), [ 2 ] [ 3 ] also called topological isomorphism , or bicontinuous function , is a bijective and continuous function between topological spaces ...
A photo of a cup of coffee. {{cc-by-sa-2.0}} File usage. More than 100 pages use this file. The following list shows the first 100 pages that use this file only.
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An SVG rendering of cup of coffee. This is an SVG rendering of the following photo. User:Herve1729 modified the SVG file to get a "no spoon" version of the image. Date: 14 December 2006: Source: Worked based on a CC-SA-2.0 photo: Author: SVG rendering by User:Peewack. Original photo by Julius Schorzman (User:Quasipalm) Other versions
Poloidal direction (red arrow) and toroidal direction (blue arrow) A torus of revolution in 3-space can be parametrized as: [2] (,) = (+ ) (,) = (+ ) (,) = using angular coordinates θ, φ ∈ [0, 2π), representing rotation around the tube and rotation around the torus's axis of revolution, respectively, where the major radius R is the distance from the center of the tube to ...
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Coffee cups and mugs may be made of glazed ceramic, [1] porcelain, plastic, glass, insulated or uninsulated metal, and other materials. In the past, coffee cups have also been made of bone, clay, and wood. [2] Disposable coffee cups may be made out of paper or polystyrene foam (often mistakenly called Styrofoam).
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