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  2. Burnside's lemma - Wikipedia

    en.wikipedia.org/wiki/Burnside's_lemma

    Burnside's lemma can compute the number of rotationally distinct colourings of the faces of a cube using three colours.. Let X be the set of 3 6 possible face color combinations that can be applied to a fixed cube, and let the rotation group G of the cube act on X by moving the colored faces: two colorings in X belong to the same orbit precisely when one is a rotation of the other.

  3. Rubik's Cube group - Wikipedia

    en.wikipedia.org/wiki/Rubik's_Cube_group

    Noticing that there are 8 corners and 12 edges, and that all the rotation groups are abelian, gives the above structure. Cube permutations, C p, is a little more complicated. It has the following two disjoint normal subgroups: the group of even permutations on the corners A 8 and the group of even permutations on the edges A 12. Complementary ...

  4. Circle group - Wikipedia

    en.wikipedia.org/wiki/Circle_group

    This gives the circle group the structure of a one-parameter group, an instance of a Lie group. In fact, up to isomorphism, it is the unique 1-dimensional compact , connected Lie group. Moreover, every n {\displaystyle n} -dimensional compact, connected, abelian Lie group is isomorphic to ⁠ T n {\displaystyle \mathbb {T} ^{n}} ⁠ .

  5. Rotation (mathematics) - Wikipedia

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

    The rotation group is a Lie group of rotations about a fixed point. This (common) fixed point or center is called the center of rotation and is usually identified with the origin. The rotation group is a point stabilizer in a broader group of (orientation-preserving) motions. For a particular rotation: The axis of rotation is a line of its ...

  6. Group action - Wikipedia

    en.wikipedia.org/wiki/Group_action

    The cyclic group C 3 consisting of the rotations by 0°, 120° and 240° acts on the set of the three vertices.. In mathematics, a group action of a group G on a set S is a group homomorphism from G to some group (under function composition) of functions from S to itself.

  7. Dihedral group - Wikipedia

    en.wikipedia.org/wiki/Dihedral_group

    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 , geometry , and chemistry .

  8. WhatsApp tests new feature to organize groups for work, school

    www.aol.com/news/whatsapp-tests-feature-organize...

    WhatsApp is testing a new feature called Communities to organize groups in larger structures that could be used by workplaces or schools, the messaging service owned by Meta Platforms said on ...

  9. List of planar symmetry groups - Wikipedia

    en.wikipedia.org/wiki/List_of_planar_symmetry_groups

    The 17 wallpaper groups, with finite fundamental domains, are given by International notation, orbifold notation, and Coxeter notation, classified by the 5 Bravais lattices in the plane: square, oblique (parallelogrammatic), hexagonal (equilateral triangular), rectangular (centered rhombic), and rhombic (centered rectangular).

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