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  2. Order (group theory) - Wikipedia

    en.wikipedia.org/wiki/Order_(group_theory)

    The consequences of the theorem include: the order of a group G is a power of a prime p if and only if ord(a) is some power of p for every a in G. [2] If a has infinite order, then all non-zero powers of a have infinite order as well. If a has finite order, we have the following formula for the order of the powers of a: ord(a k) = ord(a) / gcd ...

  3. General linear group - Wikipedia

    en.wikipedia.org/wiki/General_linear_group

    The infinite general linear group or stable general linear group is the direct limit of the inclusions GL(n, F) → GL(n + 1, F) as the upper left block matrix. It is denoted by either GL(F) or GL(∞, F), and can also be interpreted as invertible infinite matrices which differ from the identity matrix in only finitely many places. [12]

  4. List of small groups - Wikipedia

    en.wikipedia.org/wiki/List_of_small_groups

    Each group is named by Small Groups library as G o i, where o is the order of the group, and i is the index used to label the group within that order. Common group names: Z n: the cyclic group of order n (the notation C n is also used; it is isomorphic to the additive group of Z/nZ) Dih n: the dihedral group of order 2n (often the notation D n ...

  5. Difference set - Wikipedia

    en.wikipedia.org/wiki/Difference_set

    A (,,,) difference family is a set of subsets = {, …,} of a group such that the order of is , the size of is for all , and every non-identity element of can be expressed as a product of elements of for some (i.e. both , come from the same ) in exactly ways.

  6. Group by (SQL) - Wikipedia

    en.wikipedia.org/wiki/Group_by_(SQL)

    A GROUP BY statement in SQL specifies that a SQL SELECT statement partitions result rows into groups, based on their values in one or several columns. Typically, grouping is used to apply some sort of aggregate function for each group. [1] [2] The result of a query using a GROUP BY statement contains one row for

  7. Classification of finite simple groups - Wikipedia

    en.wikipedia.org/wiki/Classification_of_finite...

    In mathematics, the classification of finite simple groups (popularly called the enormous theorem [1] [2]) is a result of group theory stating that every finite simple group is either cyclic, or alternating, or belongs to a broad infinite class called the groups of Lie type, or else it is one of twenty-six exceptions, called sporadic (the Tits group is sometimes regarded as a sporadic group ...

  8. Dicyclic group - Wikipedia

    en.wikipedia.org/wiki/Dicyclic_group

    In group theory, a dicyclic group (notation Dic n or Q 4n, [1] n,2,2 [2]) is a particular kind of non-abelian group of order 4n (n > 1). It is an extension of the cyclic group of order 2 by a cyclic group of order 2n, giving the name di-cyclic. In the notation of exact sequences of groups, this extension can be expressed as:

  9. Orthogonal group - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_group

    This group is a cyclic group of order q + 1 which consists of the powers of g q−1, where g is a primitive element of F q 2, For finishing the proof, it suffices to verify that the group all orthogonal matrices is not abelian, and is the semidirect product of the group {1, −1} and the group of orthogonal matrices of determinant one.