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  2. 3D rotation group - Wikipedia

    en.wikipedia.org/wiki/3D_rotation_group

    In mechanics and geometry, the 3D rotation group, often denoted SO (3), is the group of all rotations about the origin of three-dimensional Euclidean space under the operation of composition. [1] By definition, a rotation about the origin is a transformation that preserves the origin, Euclidean distance (so it is an isometry), and orientation ...

  3. Orthogonal group - Wikipedia

    en.wikipedia.org/wiki/Orthogonal_group

    The Weyl group of SO(2n + 1) is the semidirect product {} of a normal elementary abelian 2-subgroup and a symmetric group, where the nontrivial element of each {±1} factor of {±1} n acts on the corresponding circle factor of T × {1} by inversion, and the symmetric group S n acts on both {±1} n and T × {1} by permuting factors.

  4. Fibonacci sequence - Wikipedia

    en.wikipedia.org/wiki/Fibonacci_sequence

    In mathematics, the Fibonacci sequence is a sequence in which each number is the sum of the two preceding ones. Numbers that are part of the Fibonacci sequence are known as Fibonacci numbers, commonly denoted Fn . Many writers begin the sequence with 0 and 1, although some authors start it from 1 and 1 [1][2] and some (as did Fibonacci) from 1 ...

  5. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = ⁠ 1 / 6 ⁠, B 4 = ⁠− + 1 / 30 ⁠, and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]

  6. Indefinite orthogonal group - Wikipedia

    en.wikipedia.org/wiki/Indefinite_orthogonal_group

    The group SO(1, 1) may be identified with the group of unit split-complex numbers. In terms of being a group of Lie type – i.e., construction of an algebraic group from a Lie algebra – split orthogonal groups are Chevalley groups , while the non-split orthogonal groups require a slightly more complicated construction, and are Steinberg groups .

  7. Missing Mom and 4 Children, Including 2-Week-Old Girl, Found ...

    www.aol.com/lifestyle/missing-mom-4-children...

    On Friday, Sept. 27, New South Wales Police said in a news release that Watts was last seen at around 2:30 p.m. local time in the town of Goulburn, located approximately 120 miles southwest of Sydney.

  8. Rook polynomial - Wikipedia

    en.wikipedia.org/wiki/Rook_polynomial

    The number of arrangements for a (4n + 1) × (4n + 1) board is the same as that for a 4n × 4n board; this is because on a (4n + 1) × (4n + 1) board, one rook must necessarily stand in the centre and thus the central rank and file can be removed. Therefore R 4n + 1 = R 4n. For the traditional chessboard (n = 2), R 8 = 4 × 3 × 1 = 12 possible ...

  9. E. coli infections tied to McDonald's burgers rise to 75, US ...

    www.aol.com/news/us-fda-says-75-people-151321897...

    October 25, 2024 at 12:17 PM. By Ananya Mariam Rajesh and Aishwarya Venugopal. (Reuters) -The number of people infected by the E. coli outbreak tied to McDonald's Quarter Pounder hamburgers ...