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  2. Uniformization theorem - Wikipedia

    en.wikipedia.org/wiki/Uniformization_theorem

    For compact Riemann surfaces, those with universal cover the unit disk are precisely the hyperbolic surfaces of genus greater than 1, all with non-abelian fundamental group; those with universal cover the complex plane are the Riemann surfaces of genus 1, namely the complex tori or elliptic curves with fundamental group Z 2; and those with ...

  3. 3-dimensional matching - Wikipedia

    en.wikipedia.org/wiki/3-dimensional_matching

    3-dimensional matchings. (a) Input T. (b)–(c) Solutions. In the mathematical discipline of graph theory, a 3-dimensional matching is a generalization of bipartite matching (also known as 2-dimensional matching) to 3-partite hypergraphs, which consist of hyperedges each of which contains 3 vertices (instead of edges containing 2 vertices in a usual graph).

  4. Cayley's nodal cubic surface - Wikipedia

    en.wikipedia.org/wiki/Cayley's_nodal_cubic_surface

    This contracts the 4 sides of the complete quadrilateral to the 4 nodes of the Cayley surface, while blowing up its 6 vertices to the lines through two of them. The surface is a section through the Segre cubic. [1] The surface contains nine lines, 11 tritangents and no double-sixes. [1] A number of affine forms of the surface have been presented.

  5. Möbius strip - Wikipedia

    en.wikipedia.org/wiki/Möbius_strip

    It is the simplest non-orientable surface: any other surface is non-orientable if and only if it has a Möbius strip as a subset. [5] Relatedly, when embedded into Euclidean space, the Möbius strip has only one side. A three-dimensional object that slides one time around the surface of the strip is not mirrored, but instead returns to the same ...

  6. Cubic surface - Wikipedia

    en.wikipedia.org/wiki/Cubic_surface

    In mathematics, a cubic surface is a surface in 3-dimensional space defined by one polynomial equation of degree 3. Cubic surfaces are fundamental examples in algebraic geometry . The theory is simplified by working in projective space rather than affine space , and so cubic surfaces are generally considered in projective 3-space P 3 ...

  7. Shape context - Wikipedia

    en.wikipedia.org/wiki/Shape_context

    Match each point from the known shape to a point on an unknown shape. To minimize the cost of matching, first choose a transformation (e.g. affine, thin plate spline, etc.) that warps the edges of the known shape to the unknown (essentially aligning the two shapes). Then select the point on the unknown shape that most closely corresponds to ...

  8. Catmull–Clark subdivision surface - Wikipedia

    en.wikipedia.org/wiki/Catmull–Clark_subdivision...

    The Catmull–Clark algorithm is a technique used in 3D computer graphics to create curved surfaces by using subdivision surface modeling. It was devised by Edwin Catmull and Jim Clark in 1978 as a generalization of bi-cubic uniform B-spline surfaces to arbitrary topology. [1]

  9. Euclidean planes in three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Euclidean_planes_in_three...

    This familiar equation for a plane is called the general form of the equation of the plane or just the plane equation. [6] Thus for example a regression equation of the form y = d + ax + cz (with b = −1) establishes a best-fit plane in three-dimensional space when there are two explanatory variables.

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