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  2. Permutation group - Wikipedia

    en.wikipedia.org/wiki/Permutation_group

    A permutation group is a subgroup of a symmetric group; that is, its elements are permutations of a given set. It is thus a subset of a symmetric group that is closed under composition of permutations, contains the identity permutation, and contains the inverse permutation of each of its elements. [2]

  3. The geometry and topology of three-manifolds - Wikipedia

    en.wikipedia.org/wiki/The_geometry_and_topology...

    Chapter 4 cover Dehn surgery on hyperbolic manifolds Chapter 5 covers results related to Mostow's theorem on rigidity Chapter 6 describes Gromov's invariant and his proof of Mostow's theorem. Chapter 7 (by Milnor) describes the Lobachevsky function and its applications to computing volumes of hyperbolic 3-manifolds.

  4. Arrangement of lines - Wikipedia

    en.wikipedia.org/wiki/Arrangement_of_lines

    For each pair of lines, there can be only one cell where the two lines meet at the bottom vertex, so the number of downward-bounded cells is at most the number of pairs of lines, () /. Adding the unbounded and bounded cells, the total number of cells in an arrangement can be at most n ( n + 1 ) / 2 + 1 {\displaystyle n(n+1)/2+1} . [ 5 ]

  5. Cubic surface - Wikipedia

    en.wikipedia.org/wiki/Cubic_surface

    Given an identification between a cubic surface on X and the blow-up of at 6 points in general position, the 27 lines on X can be viewed as: the 6 exceptional curves created by blowing up, the birational transforms of the 15 lines through pairs of the 6 points in , and the birational transforms of the 6 conics containing all but one of the 6 ...

  6. Lecture Notes in Mathematics - Wikipedia

    en.wikipedia.org/wiki/Lecture_Notes_in_Mathematics

    Lecture Notes in Mathematics is a book series in the field of mathematics, including articles related to both research and teaching. It was established in 1964 and was edited by A. Dold, Heidelberg and B. Eckmann, Zürich. Its publisher is Springer Science+Business Media (formerly Springer-Verlag).

  7. Projective linear group - Wikipedia

    en.wikipedia.org/wiki/Projective_linear_group

    L 2 (3) ≅ A 4 A 3 ≅ C 3 via the quotient by the Klein 4-group; L 2 (5) ≅ A 5. To construct such an isomorphism, one needs to consider the group L 2 (5) as a Galois group of a Galois cover a 5: X(5) → X(1) = P 1, where X(N) is a modular curve of level N. This cover is ramified at 12 points.

  8. Biju Patnaik University of Technology, also known as BPUT, is located in Rourkela in the state of Odisha, India. There are 110 colleges affiliated to the university. A college may be either a constituent or affiliated type. [1] The colleges are further classified as government run, private unaided and public private partnership (PPP) or private ...

  9. Cyclotomic polynomial - Wikipedia

    en.wikipedia.org/wiki/Cyclotomic_polynomial

    The case of the 105th cyclotomic polynomial is interesting because 105 is the least positive integer that is the product of three distinct odd prime numbers (3×5×7) and this polynomial is the first one that has a coefficient other than 1, 0, or −1: [3]