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  2. 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

  3. Nitrite - Wikipedia

    en.wikipedia.org/wiki/Nitrite

    The nitrite ion has the chemical formula NO − 2. Nitrite (mostly sodium nitrite) is widely used throughout chemical and pharmaceutical industries. [1] The nitrite anion is a pervasive intermediate in the nitrogen cycle in nature. The name nitrite also refers to organic compounds having the –ONO group, which are esters of nitrous acid.

  4. Mathematical structure - Wikipedia

    en.wikipedia.org/wiki/Mathematical_structure

    In Mathematics, a structure on a set (or on some sets) refers to providing it (or them) with certain additional features (e.g. an operation, relation, metric, or topology). Τhe additional features are attached or related to the set (or to the sets), so as to provide it (or them) with some additional meaning or significance.

  5. Molecular symmetry - Wikipedia

    en.wikipedia.org/wiki/Molecular_symmetry

    The symmetry group C 3v for NH 3 has the three symmetry species A 1, A 2 and E. The modes of vibration include the vibrational, rotational and translational modes. Total modes = 3A 1 + A 2 + 4E. This is a total of 12 modes because each E corresponds to 2 degenerate modes (at the same energy). Rotational modes = A 2 + E (3 modes) Translational ...

  6. Peroxynitrite - Wikipedia

    en.wikipedia.org/wiki/Peroxynitrite

    Peroxynitrite can be prepared by the reaction of superoxide with nitric oxide: [1] [2] [3] NO + O − 2 → NO(O 2) −. It is prepared by the reaction of hydrogen peroxide with nitrite: [4] H 2 O 2 + NO − 2 → ONOO − + H 2 O. Its presence is indicated by the absorbance at 302 nm (pH 12, ε 302 = 1670 M −1 cm −1).

  7. List of spherical symmetry groups - Wikipedia

    en.wikipedia.org/wiki/List_of_spherical_symmetry...

    John Conway uses a variation of the Schoenflies notation, based on the groups' quaternion algebraic structure, labeled by one or two upper case letters, and whole number subscripts. The group order is defined as the subscript, unless the order is doubled for symbols with a plus or minus, "±", prefix, which implies a central inversion .

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