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  2. Recurring - Wikipedia

    en.wikipedia.org/wiki/Recurring

    Recurring character, a character, usually on a television series, that appears from time to time and may grow into a larger role Recurring status , condition whereby a soap opera actor may be used for extended period without being under contract

  3. 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 ...

  4. Recurring character - Wikipedia

    en.wikipedia.org/wiki/Recurring_character

    A recurring character is a fictional character, usually in a prime time TV series, who frequently appears from time to time during the series' run. [1] Recurring characters often play major roles in more than one episode, sometimes being the main focus.

  5. Character (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Character_(mathematics)

    A multiplicative character (or linear character, or simply character) on a group G is a group homomorphism from G to the multiplicative group of a field , usually the field of complex numbers. If G is any group, then the set Ch( G ) of these morphisms forms an abelian group under pointwise multiplication.

  6. Vinculum (symbol) - Wikipedia

    en.wikipedia.org/wiki/Vinculum_(symbol)

    A vinculum (from Latin vinculum 'fetter, chain, tie') is a horizontal line used in mathematical notation for various purposes. It may be placed as an overline or underline above or below a mathematical expression to group the expression's elements.

  7. Recurrence relation - Wikipedia

    en.wikipedia.org/wiki/Recurrence_relation

    In mathematics, a recurrence relation is an equation according to which the th term of a sequence of numbers is equal to some combination of the previous terms. Often, only k {\displaystyle k} previous terms of the sequence appear in the equation, for a parameter k {\displaystyle k} that is independent of n {\displaystyle n} ; this number k ...

  8. Recurrent sequence - Wikipedia

    en.wikipedia.org/wiki/Recurrent_sequence

    In mathematics, recurrent sequence may refer to: A sequence satisfying a recurrence relation; Recurrent word, a sequence such that any factor (consecutive subsequence) that appears does so infinitely often, such as the Thue–Morse sequence or a Sturmian word

  9. Character theory - Wikipedia

    en.wikipedia.org/wiki/Character_theory

    When θ is the trivial character of H, the induced character obtained is known as the permutation character of G (on the cosets of H). The general technique of character induction and later refinements found numerous applications in finite group theory and elsewhere in mathematics, in the hands of mathematicians such as Emil Artin , Richard ...