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  2. Range query (computer science) - Wikipedia

    en.wikipedia.org/wiki/Range_query_(computer_science)

    Given a function that accepts an array, a range query (,) on an array = [,..,] takes two indices and and returns the result of when applied to the subarray [, …,].For example, for a function that returns the sum of all values in an array, the range query ⁡ (,) returns the sum of all values in the range [,].

  3. Matrix addition - Wikipedia

    en.wikipedia.org/wiki/Matrix_addition

    The Kronecker sum is different from the direct sum, but is also denoted by ⊕. It is defined using the Kronecker product ⊗ and normal matrix addition. If A is n -by- n , B is m -by- m and I k {\displaystyle \mathbf {I} _{k}} denotes the k -by- k identity matrix then the Kronecker sum is defined by:

  4. Select (SQL) - Wikipedia

    en.wikipedia.org/wiki/Select_(SQL)

    SELECT list is the list of columns or SQL expressions to be returned by the query. This is approximately the relational algebra projection operation. AS optionally provides an alias for each column or expression in the SELECT list. This is the relational algebra rename operation. FROM specifies from which table to get the data. [3]

  5. Multinomial theorem - Wikipedia

    en.wikipedia.org/wiki/Multinomial_theorem

    The sum is taken over all combinations of nonnegative integer indices k 1 through k m such that the sum of all k i is n. That is, for each term in the expansion, the exponents of the x i must add up to n. [2] [a] In the case m = 2, this statement reduces to that of the binomial theorem. [2]

  6. Permutation group - Wikipedia

    en.wikipedia.org/wiki/Permutation_group

    A permutation group is a subgroup of a symmetric group; that is, its elements are permutations of a given set. It is thus a subset of a symmetric group that is closed under composition of permutations, contains the identity permutation, and contains the inverse permutation of each of its elements. [2]

  7. Distribution of wealth - Wikipedia

    en.wikipedia.org/wiki/Distribution_of_wealth

    A further one billion (adult population) fall within the 10,000 – US$100,000 range. While the average wealth holding is modest in the base and middle segments of the pyramid, their total wealth amounts to US$40 trillion, underlining the potential for novel consumer products and innovative financial services targeted at this often neglected ...

  8. Columns (video game) - Wikipedia

    en.wikipedia.org/wiki/Columns_(video_game)

    Columns (Japanese: コラムス, Hepburn: Koramusu) is a match-three puzzle video game released by Jay Geertsen in 1989. Originally developed for the Motorola 68000 -based HP 9000 running HP-UX , [ 9 ] [ 10 ] [ 11 ] it was ported to Mac and MS-DOS [ 9 ] before being released commercially by Sega who ported it to arcades and then to several Sega ...

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