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  2. Sides of an equation - Wikipedia

    en.wikipedia.org/wiki/Sides_of_an_equation

    The two sides have the same value, expressed differently, since equality is symmetric. [1] More generally, these terms may apply to an inequation or inequality; the right-hand side is everything on the right side of a test operator in an expression, with LHS defined similarly.

  3. 1 + 2 + 3 + 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The infinite series whose terms are the natural numbers 1 + 2 ... of the form of the series: the terms do ... 2 + 3 + 4 + ⋯. Then multiply this equation by 4 and ...

  4. Klein bottle - Wikipedia

    en.wikipedia.org/wiki/Klein_bottle

    The boundary homomorphism is given by ∂D = 2C 1 and ∂C 1 = ∂C 2 = 0, yielding the homology groups of the Klein bottle K to be H 0 (K, Z) = Z, H 1 (K, Z) = Z×(Z/2Z) and H n (K, Z) = 0 for n > 1. There is a 2-1 covering map from the torus to the Klein bottle, because two copies of the fundamental region of the Klein bottle, one being ...

  5. Mathematics of paper folding - Wikipedia

    en.wikipedia.org/wiki/Mathematics_of_paper_folding

    The discipline of origami or paper folding has received a considerable amount of mathematical study. Fields of interest include a given paper model's flat-foldability (whether the model can be flattened without damaging it), and the use of paper folds to solve mathematical equations up to the third order. [1]

  6. Möbius strip - Wikipedia

    en.wikipedia.org/wiki/Möbius_strip

    A thin paper strip with its ends joined to form a Möbius strip can bend smoothly as a developable surface or be folded flat; the flattened Möbius strips include the trihexaflexagon. The Sudanese Möbius strip is a minimal surface in a hypersphere , and the Meeks Möbius strip is a self-intersecting minimal surface in ordinary Euclidean space.

  7. Convolution - Wikipedia

    en.wikipedia.org/wiki/Convolution

    In the particular case p = 1, this shows that L 1 is a Banach algebra under the convolution (and equality of the two sides holds if f and g are non-negative almost everywhere). More generally, Young's inequality implies that the convolution is a continuous bilinear map between suitable L p spaces.

  8. Spherical trigonometry - Wikipedia

    en.wikipedia.org/wiki/Spherical_trigonometry

    Such polygons may have any number of sides greater than 1. Two-sided spherical polygons—lunes, also called digons or bi-angles—are bounded by two great-circle arcs: a familiar example is the curved outward-facing surface of a segment of an orange. Three arcs serve to define a spherical triangle, the principal subject of this article.

  9. Common Entrance Examination - Wikipedia

    en.wikipedia.org/wiki/Common_Entrance_Examination

    At 11+, Common Entrance consists of two English examinations, as well as an examination each in Mathematics and Science. [3]At 13+, Common Entrance consists of examinations in Mathematics (three papers: a (listening) mental mathematics paper, plus written non-calculator and calculator); English (two papers); and one paper each in Latin, Classical Greek, Geography, History, Religious Studies ...