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  2. DES supplementary material - Wikipedia

    en.wikipedia.org/wiki/DES_supplementary_material

    This table specifies the input permutation on a 64-bit block. The meaning is as follows: the first bit of the output is taken from the 58th bit of the input; the second bit from the 50th bit, and so on, with the last bit of the output taken from the 7th bit of the input.

  3. Perlin noise - Wikipedia

    en.wikipedia.org/wiki/Perlin_noise

    Two-dimensional slice through 3D Perlin noise at z = 0. Perlin noise is a type of gradient noise developed by Ken Perlin in 1983. It has many uses, including but not limited to: procedurally generating terrain, applying pseudo-random changes to a variable, and assisting in the creation of image textures.

  4. Schreier–Sims algorithm - Wikipedia

    en.wikipedia.org/wiki/Schreier–Sims_algorithm

    Grow (generator, base); // By the orbit-stabilizer theorem, the permutations in the returned set are // coset representatives of the cosets of our subgroup. for (permutation in newTerritorySet) transversalSet. Add (permutation); // We now apply Schreier's lemma to find new generators for our subgroup.

  5. Simplex noise - Wikipedia

    en.wikipedia.org/wiki/Simplex_noise

    Then the resulting simplex is composed of the vertices corresponding to an ordered edge traversal from (0, 0, ..., 0) to (1, 1, ..., 1), of which there are n! possibilities, each of which corresponds to a single permutation of the coordinate. In other words, start with the zero coordinate and successively add-ones starting in the value ...

  6. Heap's algorithm - Wikipedia

    en.wikipedia.org/wiki/Heap's_algorithm

    In a 1977 review of permutation-generating algorithms, Robert Sedgewick concluded that it was at that time the most effective algorithm for generating permutations by computer. [2] The sequence of permutations of n objects generated by Heap's algorithm is the beginning of the sequence of permutations of n+1 objects.

  7. Derangement - Wikipedia

    en.wikipedia.org/wiki/Derangement

    This is the limit of the probability that a randomly selected permutation of a large number of objects is a derangement. The probability converges to this limit extremely quickly as n increases, which is why !n is the nearest integer to n!/e. The above semi-log graph shows that the derangement graph lags the permutation graph by an almost ...

  8. Inversion (discrete mathematics) - Wikipedia

    en.wikipedia.org/wiki/Inversion_(discrete...

    The six possible inversions of a 4-element permutation. The following sortable table shows the 24 permutations of four elements (in the column) with their place-based inversion sets (in the p-b column), inversion related vectors (in the , , and columns), and inversion numbers (in the # column).

  9. Toffoli gate - Wikipedia

    en.wikipedia.org/wiki/Toffoli_gate

    An input-consuming logic gate L is reversible if it meets the following conditions: (1) L(x) = y is a gate where for any output y, there is a unique input x; (2) The gate L is reversible if there is a gate L´(y) = x which maps y to x, for all y.

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