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  2. List of order theory topics - Wikipedia

    en.wikipedia.org/wiki/List_of_order_theory_topics

    Order theory is a branch of mathematics that studies various kinds of objects (often binary relations) that capture the intuitive notion of ordering, providing a framework for saying when one thing is "less than" or "precedes" another. An alphabetical list of many notions of order theory can be found in the order theory glossary.

  3. Fast-growing hierarchy - Wikipedia

    en.wikipedia.org/wiki/Fast-growing_hierarchy

    In computability theory, computational complexity theory and proof theory, a fast-growing hierarchy (also called an extended Grzegorczyk hierarchy, or a Schwichtenberg-Wainer hierarchy) [1] is an ordinal-indexed family of rapidly increasing functions f α: N → N (where N is the set of natural numbers {0, 1, ...}, and α ranges up to some large countable ordinal).

  4. Fold (higher-order function) - Wikipedia

    en.wikipedia.org/wiki/Fold_(higher-order_function)

    The extraneous intermediate list structure can be eliminated with the continuation-passing style technique, foldr f z xs == foldl (\ k x-> k. f x) id xs z; similarly, foldl f z xs == foldr (\ x k-> k. flip f x) id xs z ( flip is only needed in languages like Haskell with its flipped order of arguments to the combining function of foldl unlike e ...

  5. Sorting algorithm - Wikipedia

    en.wikipedia.org/wiki/Sorting_algorithm

    n numbers consisting of k digits each are sorted in O(n · k) time. Radix sort can process digits of each number either starting from the least significant digit (LSD) or starting from the most significant digit (MSD). The LSD algorithm first sorts the list by the least significant digit while preserving their relative order using a stable sort.

  6. Polar decomposition - Wikipedia

    en.wikipedia.org/wiki/Polar_decomposition

    The polar decomposition of a matrix can be seen as the matrix analog of the polar form of a complex number as =, where is its absolute value (a non-negative real number), and is a complex number with unit norm (an element of the circle group).

  7. Fortnite players 'tricked' into unwanted purchases are ...

    www.aol.com/fortnite-players-tricked-unwanted...

    U.S. consumers who were “tricked” into purchases they didn't want from Fortnite maker Epic Games are now starting to receive refund checks, the Federal Trade Commission said this week. Back in ...

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    Shop the best under-$50 clothing items to grab right now on Amazon. AOL. Last-minute gifts from Amazon that will still arrive by Christmas — but you need to order ASAP. See all deals. In Other News.

  9. Falling and rising factorials - Wikipedia

    en.wikipedia.org/wiki/Falling_and_rising_factorials

    When the variable is a positive integer, the number () is equal to the number of n-permutations from a set of x items, that is, the number of ways of choosing an ordered list of length n consisting of distinct elements drawn from a collection of size .