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Product of group subsets information


In mathematics, one can define a product of group subsets in a natural way. If S and T are subsets of a group G, then their product is the subset of G defined by

The subsets S and T need not be subgroups for this product to be well defined. The associativity of this product follows from that of the group product. The product of group subsets therefore defines a natural monoid structure on the power set of G.

A lot more can be said in the case where S and T are subgroups. The product of two subgroups S and T of a group G is itself a subgroup of G if and only if ST = TS.

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Product of group subsets

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one can define a product of group subsets in a natural way. If S and T are subsets of a group G, then their product is the subset of G defined by S T...

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Product

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product Cartesian product of sets Direct product of groups Semidirect product Product of group subsets Wreath product Free product Zappa–Szép product...

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Product of groups

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a product of groups usually refers to a direct product of groups, but may also mean: semidirect product Product of group subsets wreath product free...

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Direct product of groups

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group-theoretic analogue of the Cartesian product of sets and is one of several important notions of direct product in mathematics. In the context of...

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Monoid

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In the same way the power set of a group G is a monoid under the product of group subsets. Let S be a set. The set of all functions S → S forms a monoid...

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List of group theory topics

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abelian group Free group Free product Generating set of a group Group cohomology Group extension Presentation of a group Product of group subsets Schur...

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Lexicographic order

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an order on the subsets, which is also called the lexicographical order. In this context, one generally prefer to sort first the subsets by cardinality...

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Direct product

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abstractly, one talks about the product in category theory, which formalizes these notions. Examples are the product of sets, groups (described below), rings...

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Quasirandom group

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notion of quasirandom groups arises when considering subsets of groups for which no two elements in the subset have a product in the subset; such subsets are...

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Gross domestic product

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Gross Domestic Product (GDP) is a monetary measure of the market value of all the final goods and services produced and rendered in a specific time period...

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Restricted product

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restricted product is a construction in the theory of topological groups. Let I {\displaystyle I} be an index set; S {\displaystyle S} a finite subset of I {\displaystyle...

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Generating set of a group

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+ ) {\displaystyle (\mathbb {R} ,+)} . Different subsets of the same group can be generating subsets. For example, if p {\displaystyle p} and q {\displaystyle...

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Free group

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of the free group. An arbitrary group G is called free if it is isomorphic to FS for some subset S of G, that is, if there is a subset S of G such that...

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Relation algebra

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algebra operations, composition given by the product of group subsets, the converse by the inverse subset ( A − 1 = { a − 1 : a ∈ A } {\displaystyle A^{-1}=\{a^{-1}\...

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Subgroup

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group theory, a branch of mathematics, given a group G under a binary operation ∗, a subset H of G is called a subgroup of G if H also forms a group under...

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Haar measure

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"invariant volume" to subsets of locally compact topological groups, consequently defining an integral for functions on those groups. This measure was introduced...

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Polish space

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is the set of natural numbers). The following spaces are Polish: closed subsets of a Polish space, open subsets of a Polish space, products and disjoint...

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Special unitary group

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classical group, U(n) is the group that preserves the standard inner product on C n {\displaystyle \mathbb {C} ^{n}} . It is itself a subgroup of the general...

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Centralizer and normalizer

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normalizer of S are subgroups of G. Many techniques in group theory are based on studying the centralizers and normalizers of suitable subsets S. Suitably...

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Group action

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group as an abstract group, and to say that one has a group action of the abstract group that consists of performing the transformations of the group...

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Semidirect product

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specifically in group theory, the concept of a semidirect product is a generalization of a direct product. There are two closely related concepts of semidirect...

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Glossary of mathematical symbols

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direct product of groups, the element of H may change if the order of the factors is changed.) 2.  Outer semidirect product: if N and H are two groups, and...

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Empty product

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In mathematics, an empty product, or nullary product or vacuous product, is the result of multiplying no factors. It is by convention equal to the multiplicative...

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Topological group

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{\displaystyle S} ). This example also shows that complete subsets (indeed, even compact subsets) of a non-Hausdorff space may fail to be closed (for example...

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Connected space

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non-empty open subsets. Connectedness is one of the principal topological properties that are used to distinguish topological spaces. A subset of a topological...

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Pearson correlation coefficient

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linear correlation between two sets of data. It is the ratio between the covariance of two variables and the product of their standard deviations; thus,...

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Lebesgue measure

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branch of mathematics, the Lebesgue measure, named after French mathematician Henri Lebesgue, is the standard way of assigning a measure to subsets of higher...

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Orthogonal group

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groups list of simple Lie groups Representations of classical Lie groups Brauer algebra Infinite subsets of a compact space have an accumulation point and...

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