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proof surface

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  • Surface computer — A surface computer is a computer that interacts with the user through the surface of an ordinary object, rather than through a monitor and keyboard.The category was created by Microsoft with Surface (codenamed Milan), the surface computer from… …   Wikipedia

  • Proof coinage — means special early samples of a coin issue, historically made for checking the dies and for archival purposes, but nowadays often struck in greater numbers specially for coin collectors (numismatists). Many countries now issue them. Production… …   Wikipedia

  • Proof-of-payment — or POP is an honor based fare collection approach used on many public transportation systems. Instead of checking each passenger as they enter a fare control zone, proof of payment requires that each passenger carry a ticket or pass proving that… …   Wikipedia

  • Surface — This article discusses surfaces from the point of view of topology. For other uses, see Differential geometry of surfaces, algebraic surface, and Surface (disambiguation). An open surface with X , Y , and Z contours shown. In mathematics,… …   Wikipedia

  • proof — /proohf/, n. 1. evidence sufficient to establish a thing as true, or to produce belief in its truth. 2. anything serving as such evidence: What proof do you have? 3. the act of testing or making trial of anything; test; trial: to put a thing to… …   Universalium

  • Surface tension — For the work of fiction, see Surface Tension (short story). Surface tension is a property of the surface of a liquid that causes it to behave as an elastic sheet. It allows insects, such as the water strider (pond skater, UK), to walk on water.… …   Wikipedia

  • proof — [[t]pruf[/t]] n. 1) evidence sufficient to establish a thing as true or believable 2) anything serving as such evidence 3) the act of testing or trying anything; test; trial: to put a thing to the proof[/ex] 4) the establishment of the truth of… …   From formal English to slang

  • Surface bundle over the circle — In mathematics, a surface bundle over the circle is a fiber bundle with base space a circle, and with fiber space a surface. Therefore the total space has dimension 2 + 1 = 3. In general, fiber bundles over the circle are a special case of… …   Wikipedia

  • Surface of class VII — In mathematics, surfaces of class VII are non algebraic complex surfaces studied by (Kodaira 1964, 1968) that have Kodaira dimension −∞ and first Betti number 1. Minimal surfaces of class VII (those with no rational curves with self… …   Wikipedia

  • Boy's surface/Proofs — Property of R. Bryant s parametrizationIf z is replaced by the negative reciprocal of its complex conjugate, {1 over z^star}, then the functions g1 , g2 , and g3 of z are left unchanged.ProofLet g1 prime; be obtained from g1 by substituting z… …   Wikipedia

  • Boy's surface — In geometry, Boy s surface is an immersion of the real projective plane in 3 dimensional space found by Werner Boy in 1901 (he discovered it on assignment from David Hilbert to prove that the projective plane could not be immersed in 3 space).… …   Wikipedia

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