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  2. Symmetry - Wikipedia

    en.wikipedia.org/wiki/Symmetry

    [4] [b] This article describes symmetry from three perspectives: in mathematics, including geometry, the most familiar type of symmetry for many people; in science and nature; and in the arts, covering architecture, art, and music. The opposite of symmetry is asymmetry, which refers to the absence of symmetry.

  3. Tetrahedron - Wikipedia

    en.wikipedia.org/wiki/Tetrahedron

    This gives two opposite edges (1,2) and (3,4) that are perpendicular but different lengths, and then the 4 isometries are 1, reflections (12) and (34) and the 180° rotation (12)(34). The symmetry group is C 2v, isomorphic to the Klein four-group V 4. A digonal disphenoid has Schläfli symbol { }∨{ }. C 2v C 2 [2] [2] + *22 22: 4 2 Phyllic ...

  4. Square - Wikipedia

    en.wikipedia.org/wiki/Square

    r8 is full symmetry of the square, and a1 is no symmetry. d4 is the symmetry of a rectangle, and p4 is the symmetry of a rhombus. These two forms are duals of each other, and have half the symmetry order of the square. d2 is the symmetry of an isosceles trapezoid, and p2 is the symmetry of a kite. g2 defines the geometry of a parallelogram.

  5. Tetrahedral symmetry - Wikipedia

    en.wikipedia.org/wiki/Tetrahedral_symmetry

    The pyritohedral group T h with fundamental domain The seams of a volleyball have pyritohedral symmetry. T h, 3*2, [4,3 +] or m 3, of order 24 – pyritohedral symmetry. [1] This group has the same rotation axes as T, with mirror planes through two of the orthogonal directions. The 3-fold axes are now S 6 (3) axes, and there is a central ...

  6. 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

  7. US appeals court halts enforcement of anti-money laundering law

    www.aol.com/news/us-appeals-court-halts...

    By Nate Raymond (Reuters) -A U.S. appeals court has halted enforcement of an anti-money laundering law that requires corporate entities to disclose the identities of their real beneficial owners ...

  8. Point groups in three dimensions - Wikipedia

    en.wikipedia.org/wiki/Point_groups_in_three...

    The two groups are obtained from it by changing 2-fold rotational symmetry to 4-fold, and adding 5-fold symmetry, respectively. There are two crystallographic point groups with the property that no crystallographic point group has it as proper subgroup: O h and D 6h. Their maximal common subgroups, depending on orientation, are D 3d and D 2h.

  9. Woman Says Sister-in-Law Is Upset After She Didn’t Eat Her ...

    www.aol.com/lifestyle/woman-says-sister-law...

    The online community seemed divided. Some argued that the original poster not eating the sweet potato casserole was reasonable, whether it was from last year or made fresh.

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