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  2. Combinatorial number system - Wikipedia

    en.wikipedia.org/wiki/Combinatorial_number_system

    If k > 1 the remaining elements of the k-combination form the k − 1-combination corresponding to the number () in the combinatorial number system of degree k − 1, and can therefore be found by continuing in the same way for and k − 1 instead of N and k.

  3. Combinatorics on words - Wikipedia

    en.wikipedia.org/wiki/Combinatorics_on_words

    Square-free words do not have adjacent repeated factors. [1] To clarify, "dining" is not square-free since "in" is repeated consecutively, while "servers" is square-free, its two "er" factors not being adjacent. Thue proves his conjecture on the existence of infinite square-free words by using substitutions. A substitution is a way to take a ...

  4. Word-representable graph - Wikipedia

    en.wikipedia.org/wiki/Word-representable_graph

    Another way to generalise the notion of a word-representable graph, again suggested by Remmel, is to introduce the "degree of tolerance" k for occurrences of a pattern p defining edges/non-edges. That is, we can say that if there are up to k occurrence of p formed by letters a and b , then there is an edge between a and b .

  5. Lyndon word - Wikipedia

    en.wikipedia.org/wiki/Lyndon_word

    Initially, k = 0. While k and m are less than N, compare S[k] (the k-th symbol of the string S) to S[m]. There are three possible outcomes: S[k] is equal to S[m]: append S[m] to the current collected symbols. Increment k and m. S[k] is less than S[m]: if we append S[m] to the current collected symbols, we'll get a Lyndon word. But we can't add ...

  6. Separating words problem - Wikipedia

    en.wikipedia.org/wiki/Separating_words_problem

    More generally, if a pattern of length k appears a different number of times in the two words, they can be distinguished from each other using O(k log n) states. [1] If two binary words differ from each other within their first or last k positions, they can be distinguished from each other using k + O(1) states.

  7. Non-numerical words for quantities - Wikipedia

    en.wikipedia.org/wiki/Non-numerical_words_for...

    The English language has a number of words that denote specific or approximate quantities that are themselves not numbers. [1] Along with numerals, and special-purpose words like some, any, much, more, every, and all, they are quantifiers. Quantifiers are a kind of determiner and occur in many constructions with other determiners, like articles ...

  8. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. AD 801–873 ), who formally developed the method (the ciphers breakable by this technique go ...

  9. Complete graph - Wikipedia

    en.wikipedia.org/wiki/Complete_graph

    The complete graph on n vertices is denoted by K n.Some sources claim that the letter K in this notation stands for the German word komplett, [4] but the German name for a complete graph, vollständiger Graph, does not contain the letter K, and other sources state that the notation honors the contributions of Kazimierz Kuratowski to graph theory.