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  2. G2 (mathematics) - Wikipedia

    en.wikipedia.org/wiki/G2_(mathematics)

    When q ≠ 2, the group is simple, and when q = 2, it has a simple subgroup of index 2 isomorphic to 2 A 2 (3 2), and is the automorphism group of a maximal order of the octonions. The Janko group J 1 was first constructed as a subgroup of G 2 (11). Ree (1960) introduced twisted Ree groups 2 G 2 (q) of order q 3 (q 3 + 1)(q − 1) for q = 3 2n ...

  3. Mathematical notation - Wikipedia

    en.wikipedia.org/wiki/Mathematical_notation

    [2] In order to have more symbols, and for allowing related mathematical objects to be represented by related symbols, diacritics , subscripts and superscripts are often used. For example, f 1 ′ ^ {\displaystyle {\hat {f'_{1}}}} may denote the Fourier transform of the derivative of a function called f 1 . {\displaystyle f_{1}.}