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  2. List of United States dependent visas - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    J-2 visa - for dependents of those admitted on a J-1 visa. J-2 dependents may study while in the US and apply for authorization to work [3] K-2 visa - for the children of those admitted under a K-1 visa [1]: 37 K-4 visa - for the children of those admitted under a K-3 visa [1]: 37 L-2 visa - for dependents of those admitted under an L-1 visa. L ...

  3. Symmetry number - Wikipedia

    en.wikipedia.org/wiki/Symmetry_number

    The symmetry number or symmetry order of an object is the number of different but indistinguishable (or equivalent) arrangements (or views) of the object, that is, it is the order of its symmetry group. The object can be a molecule, crystal lattice, lattice, tiling, or in general any kind of mathematical object that admits symmetries. [1]

  4. List of character tables for chemically important 3D point groups

    en.wikipedia.org/wiki/List_of_character_tables...

    These groups are characterized by i) an n-fold proper rotation axis C n; ii) n 2-fold proper rotation axes C 2 normal to C n; iii) a mirror plane σ h normal to C n and containing the C 2 s. The D 1 h group is the same as the C 2 v group in the pyramidal groups section.

  5. Hermann–Mauguin notation - Wikipedia

    en.wikipedia.org/wiki/Hermann–Mauguin_notation

    For example, 2 1 is a 180° (twofold) rotation followed by a translation of ⁠ 1 / 2 ⁠ of the lattice vector. 3 1 is a 120° (threefold) rotation followed by a translation of ⁠ 1 / 3 ⁠ of the lattice vector. The possible screw axes are: 2 1, 3 1, 3 2, 4 1, 4 2, 4 3, 6 1, 6 2, 6 3, 6 4, and 6 5.

  6. 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.

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  8. At least 2 dead after severe weather moved through ...

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    An additional 4 to 6 inches or more rain and 1 to 2 feet of mountain snow is likely. The East Montgomery County Fire Department said that Station 154 in New Caney, Texas, "sustained extensive ...

  9. Rotational partition function - Wikipedia

    en.wikipedia.org/wiki/Rotational_partition_function

    Rotational energies are quantized. For a diatomic molecule like CO or HCl, or a linear polyatomic molecule like OCS in its ground vibrational state, the allowed rotational energies in the rigid rotor approximation are = = (+) = (+). J is the quantum number for total rotational angular momentum and takes all integer values starting at zero, i.e., =,,, …, = is the rotational constant, and is ...

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