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  2. Combinations and permutations - Wikipedia

    en.wikipedia.org/wiki/Combinations_and_permutations

    Combinations and permutations in the mathematical sense are described in several articles. Described together, in-depth: Twelvefold way; Explained separately in a more accessible way: Combination; Permutation; For meanings outside of mathematics, please see both words’ disambiguation pages: Combination (disambiguation) Permutation ...

  3. Cycles and fixed points - Wikipedia

    en.wikipedia.org/wiki/Cycles_and_fixed_points

    (3.a) We may choose one of the f(k − 1, j − 1) permutations with k − 1 elements and j − 1 fixed points and add element k as a new fixed point. (3.b) We may choose one of the f(k − 1, j) permutations with k − 1 elements and j fixed points and insert element k in an existing cycle of length > 1 in front of one of the (k − 1) − j ...

  4. Twelvefold way - Wikipedia

    en.wikipedia.org/wiki/Twelvefold_way

    The formula counting all functions N → X is not useful here, because the number of them grouped together by permutations of N varies from one function to another. Rather, as explained under combinations , the number of n -multicombinations from a set with x elements can be seen to be the same as the number of n -combinations from a set with x ...

  5. Steinhaus–Johnson–Trotter algorithm - Wikipedia

    en.wikipedia.org/wiki/Steinhaus–Johnson...

    The Steinhaus–Johnson–Trotter algorithm follows this structure: the sequence of permutations it generates consists of ()! blocks of permutations, so that within each block the permutations agree on the ordering of the numbers from 1 to and differ only in the position of . The blocks themselves are ordered recursively, according to the ...

  6. Permutation - Wikipedia

    en.wikipedia.org/wiki/Permutation

    This would have been the first attempt on record to solve a difficult problem in permutations and combinations. [4] Al-Khalil (717–786), an Arab mathematician and cryptographer, wrote the Book of Cryptographic Messages. It contains the first use of permutations and combinations, to list all possible Arabic words with and without vowels. [5]

  7. Permutation pattern - Wikipedia

    en.wikipedia.org/wiki/Permutation_pattern

    A k-superpattern is a permutation that contains all permutations of length k. For example, 25314 is a 3-superpattern because it contains all 6 permutations of length 3. It is known that k-superpatterns must have length at least k 2 /e 2, where e ≈ 2.71828 is Euler's number, [33] and that there exist k-superpatterns of length ⌈(k 2 + 1)/2 ...

  8. Combinatorics - Wikipedia

    en.wikipedia.org/wiki/Combinatorics

    Combinatorics is an area of mathematics primarily concerned with counting, both as a means and as an end to obtaining results, and certain properties of finite structures.It is closely related to many other areas of mathematics and has many applications ranging from logic to statistical physics and from evolutionary biology to computer science.

  9. File:Permutation matrices.pdf - Wikipedia

    en.wikipedia.org/wiki/File:Permutation_matrices.pdf

    What links here; Upload file; Special pages; Printable version; Page information; Get shortened URL; Download QR code

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