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2. Permutation representation - Wikipedia

   en.wikipedia.org/wiki/Permutation_representation

   Now the character of this representation is defined as the trace of this permutation matrix. An element on the diagonal of a permutation matrix is 1 if the point in is fixed, and 0 otherwise. So we can conclude that the trace of the permutation matrix is exactly equal to the number of fixed points of .

3. Levi-Civita symbol - Wikipedia

   en.wikipedia.org/wiki/Levi-Civita_symbol

   In two dimensions, the Levi-Civita symbol is defined by: = {+ (,) = (,) (,) = (,) = The values can be arranged into a 2 × 2 antisymmetric matrix: = (). Use of the two-dimensional symbol is common in condensed matter, and in certain specialized high-energy topics like supersymmetry [1] and twistor theory, [2] where it appears in the context of 2-spinors.

4. Permutation - Wikipedia

   en.wikipedia.org/wiki/Permutation

   The values of a[2] and a[3] are swapped to form the new sequence [1, 2, 4, 3]. The sequence after k-index a[2] to the final element is reversed. Because only one value lies after this index (the 3), the sequence remains unchanged in this instance. Thus the lexicographic successor of the initial state is permuted: [1, 2, 4, 3].

5. Permutation graph - Wikipedia

   en.wikipedia.org/wiki/Permutation_graph

   Permutation graphs may also be defined geometrically, as the intersection graphs of line segments whose endpoints lie on two parallel lines. Different permutations may give rise to the same permutation graph; a given graph has a unique representation (up to permutation symmetry) if it is prime with respect to the modular decomposition. [1]

6. Cycles and fixed points - Wikipedia

   en.wikipedia.org/wiki/Cycles_and_fixed_points

   G has 2 fixed points, 1 2-cycle and 3 4-cycles B has 4 fixed points and 6 2-cycles GB has 2 fixed points and 2 7-cycles P * (1,2,3,4) T = (4,1,3,2) T Permutation of four elements with 1 fixed point and 1 3-cycle. In mathematics, the cycles of a permutation π of a finite set S correspond bijectively to the orbits of the subgroup generated by π ...

7. 100 prisoners problem - Wikipedia

   en.wikipedia.org/wiki/100_prisoners_problem

   Graph representations of the permutations (1 7 5)(2 4 8)(3 6) and (1 3 7 4 5 8 2)(6) The prison director's assignment of prisoner numbers to drawers can mathematically be described as a permutation of the numbers 1 to 100.