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The symmetric group on a finite set is the group whose elements are all bijective functions from to and whose group operation is that of function composition. [1] For finite sets, "permutations" and "bijective functions" refer to the same operation, namely rearrangement. The symmetric group of degree is the symmetric group on the set .
In mathematics, the representation theory of the symmetric group is a particular case of the representation theory of finite groups, for which a concrete and detailed theory can be obtained. This has a large area of potential applications, from symmetric function theory to quantum chemistry studies of atoms, molecules and solids. [1][2] The ...
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.
The symmetry group of a snowflake is D 6, a dihedral symmetry, the same as for a regular hexagon. In mathematics, a dihedral group is the group of symmetries of a regular polygon, [1][2] which includes rotations and reflections. Dihedral groups are among the simplest examples of finite groups, and they play an important role in group theory and ...
In group theory, Cayley's theorem, named in honour of Arthur Cayley, states that every group G is isomorphic to a subgroup of a symmetric group. [1] More specifically, G is isomorphic to a subgroup of the symmetric group whose elements are the permutations of the underlying set of G. Explicitly, The homomorphism can also be understood as ...
Elements. The point group symmetry of a molecule is defined by the presence or absence of 5 types of symmetry element. Symmetry axis: an axis around which a rotation by. 360 ∘ n {\displaystyle {\tfrac {360^ {\circ }} {n}}} results in a molecule indistinguishable from the original. This is also called an n -fold rotational axis and abbreviated Cn.
The group of all permutations of a set M is the symmetric group of M, often written as Sym (M). [ 1 ] The term permutation group thus means a subgroup of the symmetric group. If M = {1, 2, ..., n} then Sym (M) is usually denoted by S n, and may be called the symmetric group on n letters.
This map carries the simple group A 6 nontrivially into (hence onto) the subgroup PSL 2 (9) of index 4 in the semi-direct product G, so S 6 is thereby identified as an index-2 subgroup of G (namely, the subgroup of G generated by PSL 2 (9) and the Galois involution). Conjugation by any element of G outside of S 6 defines the nontrivial outer ...