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  2. Klein four-group - Wikipedia

    en.wikipedia.org/wiki/Klein_four-group

    V is the symmetry group of this cross: flipping it horizontally (a) or vertically (b) or both (ab) leaves it unchanged.A quarter-turn changes it. In two dimensions, the Klein four-group is the symmetry group of a rhombus and of rectangles that are not squares, the four elements being the identity, the vertical reflection, the horizontal reflection, and a 180° rotation.

  3. Geometric progression - Wikipedia

    en.wikipedia.org/wiki/Geometric_progression

    The first block is a unit block and the dashed line represents the infinite sum of the sequence, a number that it will forever approach but never touch: 2, 3/2, and 4/3 respectively. A geometric progression , also known as a geometric sequence , is a mathematical sequence of non-zero numbers where each term after the first is found by ...

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The term algebra is derived from the Arabic word al-jabr meaning 'the reunion of broken parts' that he used for naming one of these methods in the title of his main treatise. [31] [32] Algebra became an area in its own right only with François Viète (1540–1603), who introduced the use of variables for representing unknown or unspecified ...

  5. Sequential art - Wikipedia

    en.wikipedia.org/wiki/Sequential_art

    In comics studies, sequential art is a term proposed by comics artist Will Eisner [1] to describe art forms that use images deployed in a specific order for the purpose of graphic storytelling [2] (i.e., narration of graphic stories) [3] or conveying information. [2] The best-known example of sequential art is comics. [4]

  6. Sequence - Wikipedia

    en.wikipedia.org/wiki/Sequence

    A related sequence is the sequence of decimal digits of π, that is, (3, 1, 4, 1, 5, 9, ...). Unlike the preceding sequence, this sequence does not have any pattern that is easily discernible by inspection. Other examples are sequences of functions, whose elements are functions instead of numbers.

  7. Five lemma - Wikipedia

    en.wikipedia.org/wiki/Five_lemma

    The five lemma is often applied to long exact sequences: when computing homology or cohomology of a given object, one typically employs a simpler subobject whose homology/cohomology is known, and arrives at a long exact sequence which involves the unknown homology groups of the original object. This alone is often not sufficient to determine ...

  8. Runge–Kutta methods - Wikipedia

    en.wikipedia.org/wiki/Runge–Kutta_methods

    For example, a two-stage method has order 2 if b 1 + b 2 = 1, b 2 c 2 = 1/2, and b 2 a 21 = 1/2. [8] Note that a popular condition for determining coefficients is [ 8 ] ∑ j = 1 i − 1 a i j = c i for i = 2 , … , s . {\displaystyle \sum _{j=1}^{i-1}a_{ij}=c_{i}{\text{ for }}i=2,\ldots ,s.}

  9. Regular sequence - Wikipedia

    en.wikipedia.org/wiki/Regular_sequence

    For example, x, y(1-x), z(1-x) is a regular sequence in the polynomial ring C[x, y, z], while y(1-x), z(1-x), x is not a regular sequence. But if R is a Noetherian local ring and the elements r i are in the maximal ideal, or if R is a graded ring and the r i are homogeneous of positive degree, then any permutation of a regular sequence is a ...

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