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  2. List of small groups - Wikipedia

    en.wikipedia.org/wiki/List_of_small_groups

    In some sense this reduces the classification of these groups to the classification of p -groups. Some of the small groups that do not have a normal p -complement include: Order 24: The symmetric group S 4. Order 48: The binary octahedral group and the product S4 × Z2. Order 60: The alternating group A 5.

  3. Group (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Group_(mathematics)

    A group is said to act on another mathematical object ⁠ ⁠ if every group element can be associated to some operation on ⁠ ⁠ and the composition of these operations follows the group law. For example, an element of the (2,3,7) triangle group acts on a triangular tiling of the hyperbolic plane by permuting the triangles. [50]

  4. Group theory - Wikipedia

    en.wikipedia.org/wiki/Group_theory

    Group theory has three main historical sources: number theory, the theory of algebraic equations, and geometry. The number-theoretic strand was begun by Leonhard Euler, and developed by Gauss's work on modular arithmetic and additive and multiplicative groups related to quadratic fields.

  5. Special unitary group - Wikipedia

    en.wikipedia.org/wiki/Special_unitary_group

    t. e. In mathematics, the special unitary group of degree n, denoted SU (n), is the Lie group of n × n unitary matrices with determinant 1. The matrices of the more general unitary group may have complex determinants with absolute value 1, rather than real 1 in the special case. The group operation is matrix multiplication.

  6. Fractional factorial design - Wikipedia

    en.wikipedia.org/wiki/Fractional_factorial_design

    Each generator halves the number of runs required. A design with p such generators is a 1/(l p)=l −p fraction of the full factorial design. [3] For example, a 2 52 design is 1/4 of a two-level, five-factor factorial design. Rather than the 32 runs that would be required for the full 2 5 factorial experiment, this experiment requires only ...

  7. Presentation of a group - Wikipedia

    en.wikipedia.org/wiki/Presentation_of_a_group

    For example, the dihedral group D 8 of order sixteen can be generated by a rotation, r, of order 8; and a flip, f, of order 2; and certainly any element of D 8 is a product of r ' s and f ' s. However, we have, for example, rfr = f −1, r 7 = r −1, etc., so such products are not unique in D 8. Each such product equivalence can be expressed ...

  8. Unit fraction - Wikipedia

    en.wikipedia.org/wiki/Unit_fraction

    The topic of Egyptian fractions has also seen interest in modern number theory; for instance, the Erdős–Graham problem [9] and the Erdős–Straus conjecture [10] concern sums of unit fractions, as does the definition of Ore's harmonic numbers. [11] A pattern of spherical triangles with reflection symmetry across each triangle edge.

  9. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    A simple fraction (also known as a common fraction or vulgar fraction, where vulgar is Latin for "common") is a rational number written as a / b or ⁠ ⁠, where a and b are both integers. [9] As with other fractions, the denominator (b) cannot be zero. Examples include ⁠ 1 2 ⁠, − ⁠ 8 5 ⁠, ⁠ −8 5 ⁠, and ⁠ 8 −5 ⁠.

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