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Symmetry group information


A regular tetrahedron is invariant under twelve distinct rotations (if the identity transformation is included as a trivial rotation and reflections are excluded). These are illustrated here in the cycle graph format, along with the 180° edge (blue arrows) and 120° vertex (pink and orange arrows) rotations that permute the tetrahedron through the positions. The twelve rotations form the rotation (symmetry) group of the figure.

In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group operation of composition. Such a transformation is an invertible mapping of the ambient space which takes the object to itself, and which preserves all the relevant structure of the object. A frequent notation for the symmetry group of an object X is G = Sym(X).

For an object in a metric space, its symmetries form a subgroup of the isometry group of the ambient space. This article mainly considers symmetry groups in Euclidean geometry, but the concept may also be studied for more general types of geometric structure.

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Symmetry group

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In group theory, the symmetry group of a geometric object is the group of all transformations under which the object is invariant, endowed with the group...

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Wallpaper group

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corresponds a group of congruent transformations, with function composition as the group operation. Thus, a wallpaper group (or plane symmetry group or plane...

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Group theory

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known fundamental forces in the universe, may be modelled by symmetry groups. Thus group theory and the closely related representation theory have many...

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Dihedral group

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mathematics, a dihedral group is the group of symmetries of a regular polygon, which includes rotations and reflections. Dihedral groups are among the simplest...

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Molecular symmetry

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molecular symmetry describes the symmetry present in molecules and the classification of these molecules according to their symmetry. Molecular symmetry is a...

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Symmetry

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Symmetry (from Ancient Greek συμμετρία (summetría) 'agreement in dimensions, due proportion, arrangement') in everyday life refers to a sense of harmonious...

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Rotational symmetry

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preserving orientation. Therefore, a symmetry group of rotational symmetry is a subgroup of E +(m) (see Euclidean group). Symmetry with respect to all rotations...

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Gauge theory

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form a Lie group—referred to as the symmetry group or the gauge group of the theory. Associated with any Lie group is the Lie algebra of group generators...

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Octahedral symmetry

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of symmetries, since it is the polyhedron that is dual to an octahedron. The group of orientation-preserving symmetries is S4, the symmetric group or...

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Icosahedral symmetry

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equivalently, symmetries on the sphere) with the largest symmetry groups. Icosahedral symmetry is not compatible with translational symmetry, so there are...

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Space group

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a space group is the symmetry group of a repeating pattern in space, usually in three dimensions. The elements of a space group (its symmetry operations)...

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Tetrahedral symmetry

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orientation-preserving) symmetries, and a symmetry order of 24 including transformations that combine a reflection and a rotation. The group of all (not necessarily...

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Coxeter group

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Coxeter groups are precisely the finite Euclidean reflection groups; for example, the symmetry group of each regular polyhedron is a finite Coxeter group. However...

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Platonic solid

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The order of the symmetry group is the number of symmetries of the polyhedron. One often distinguishes between the full symmetry group, which includes...

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Spontaneous symmetry breaking

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Spontaneous symmetry breaking is a spontaneous process of symmetry breaking, by which a physical system in a symmetric state spontaneously ends up in an...

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Point groups in three dimensions

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one of them. The symmetry group of an object is sometimes also called its full symmetry group, as opposed to its proper symmetry group, the intersection...

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Mathematics of Sudoku

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dihedral symmetry (a 90° rotational symmetry, which also includes a symmetry on both orthogonal axis, 180° rotational symmetry, and diagonal symmetry) is known...

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Plane symmetry

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the set of plane symmetries that preserve the pattern forms a group. The groups that arise in this way are plane symmetry groups and are of considerable...

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Cyclic group

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rotation) then this symmetry group is isomorphic to Z/nZ. In three or higher dimensions there exist other finite symmetry groups that are cyclic, but...

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Frieze group

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according to their symmetries. The set of symmetries of a frieze pattern is called a frieze group. Frieze groups are two-dimensional line groups, having repetition...

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Symmetry in biology

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Symmetry in biology refers to the symmetry observed in organisms, including plants, animals, fungi, and bacteria. External symmetry can be easily seen...

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Crystallographic point group

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In crystallography, a crystallographic point group is a three dimensional point group whose symmetry operations are compatible with a three dimensional...

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