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  2. Group (mathematics) - Wikipedia

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

    The manipulations of the Rubik's Cube form the Rubik's Cube group.. In mathematics, a group is a set with an operation that associates an element of the set to every pair of elements of the set (as does every binary operation) and satisfies the following constraints: the operation is associative, it has an identity element, and every element of the set has an inverse element.

  3. Examples of groups - Wikipedia

    en.wikipedia.org/wiki/Examples_of_groups

    In mathematics this group is known as the dihedral group of order 8, and is either denoted Dih 4, D 4 or D 8, depending on the convention. This was an example of a non-abelian group: the operation ∘ here is not commutative , which can be seen from the table; the table is not symmetrical about the main diagonal.

  4. Group theory - Wikipedia

    en.wikipedia.org/wiki/Group_theory

    Plus teacher and student package: Group Theory This package brings together all the articles on group theory from Plus, the online mathematics magazine produced by the Millennium Mathematics Project at the University of Cambridge, exploring applications and recent breakthroughs, and giving explicit definitions and examples of groups.

  5. 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 ...

  6. Simple group - Wikipedia

    en.wikipedia.org/wiki/Simple_group

    In mathematics, a simple group is a nontrivial group whose only normal subgroups are the trivial group and the group itself. A group that is not simple can be broken into two smaller groups, namely a nontrivial normal subgroup and the corresponding quotient group .

  7. Mathematical structure - Wikipedia

    en.wikipedia.org/wiki/Mathematical_structure

    In Mathematics, a structure on a set (or on some sets) refers to providing it (or them) with certain additional features (e.g. an operation, relation, metric, or topology). Τhe additional features are attached or related to the set (or to the sets), so as to provide it (or them) with some additional meaning or significance.

  8. Group object - Wikipedia

    en.wikipedia.org/wiki/Group_object

    In category theory, a branch of mathematics, group objects are certain generalizations of groups that are built on more complicated structures than sets.A typical example of a group object is a topological group, a group whose underlying set is a topological space such that the group operations are continuous.

  9. Arithmetic group - Wikipedia

    en.wikipedia.org/wiki/Arithmetic_group

    In mathematics, an arithmetic group is a group obtained as the integer points of an algebraic group, for example (). They arise naturally in the study of arithmetic properties of quadratic forms and other classical topics in number theory .

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