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  2. Rotational symmetry - Wikipedia

    en.wikipedia.org/wiki/Rotational_symmetry

    Therefore, the number of 2-, 3-, 4-, and 6-fold rotocenters per primitive cell is 4, 3, 2, and 1, respectively, again including 4-fold as a special case of 2-fold, etc. 3-fold rotational symmetry at one point and 2-fold at another one (or ditto in 3D with respect to parallel axes) implies rotation group p6, i.e. double translational symmetry ...

  3. Symmetry (geometry) - Wikipedia

    en.wikipedia.org/wiki/Symmetry_(geometry)

    The triskelion has 3-fold rotational symmetry. Rotational symmetry is symmetry with respect to some or all rotations in m-dimensional Euclidean space. Rotations are direct isometries, which are isometries that preserve orientation. [17] Therefore, a symmetry group of rotational symmetry is a subgroup of the special Euclidean group E + (m).

  4. Dihedral group - Wikipedia

    en.wikipedia.org/wiki/Dihedral_group

    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.

  5. AOL Video - Serving the best video content from AOL and ...

    www.aol.com/video/view/how-to-identify-if-a...

    The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.

  6. Penrose tiling - Wikipedia

    en.wikipedia.org/wiki/Penrose_tiling

    Any Penrose tiling has local pentagonal symmetry, in the sense that there are points in the tiling surrounded by a symmetric configuration of tiles: such configurations have fivefold rotational symmetry about the center point, as well as five mirror lines of reflection symmetry passing through the point, a dihedral symmetry group. [9]

  7. Pentomino - Wikipedia

    en.wikipedia.org/wiki/Pentomino

    It has point symmetry, also known as rotational symmetry of order 2. Its symmetry group has two elements, the identity and the 180° rotation. I can be oriented in 2 ways by rotation. It has two axes of reflection symmetry, both aligned with the gridlines. Its symmetry group has four elements, the identity, two reflections and the 180° rotation.

  8. Symmetry in mathematics - Wikipedia

    en.wikipedia.org/wiki/Symmetry_in_mathematics

    Symmetry occurs not only in geometry, but also in other branches of mathematics. Symmetry is a type of invariance: the property that a mathematical object remains unchanged under a set of operations or transformations. [1] Given a structured object X of any sort, a symmetry is a mapping of the object onto itself which preserves the structure.

  9. Polyomino - Wikipedia

    en.wikipedia.org/wiki/Polyomino

    symmetry with respect to both diagonal directions, and hence also 2-fold rotational symmetry: D 2 (7) 4-fold rotational symmetry: C 4 (8) 1 fixed polyomino for each free polyomino: all symmetry of the square: D 4 (1). In the same way, the number of one-sided polyominoes depends on polyomino symmetry as follows: 2 one-sided polyominoes for each ...