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  2. X&Y - Wikipedia

    en.wikipedia.org/wiki/X&Y

    X&Y is the third studio album by British band Coldplay, released on 6 June 2005 by Parlophone in the United Kingdom, and a day later by Capitol Records in the United States. Produced by Coldplay and producer Danton Supple , the album was recorded during a turbulent period for the band, during which their manager and creative director, Phil ...

  3. Rotation of axes in two dimensions - Wikipedia

    en.wikipedia.org/wiki/Rotation_of_axes_in_two...

    In mathematics, a rotation of axes in two dimensions is a mapping from an xy-Cartesian coordinate system to an x′y′-Cartesian coordinate system in which the origin is kept fixed and the x′ and y′ axes are obtained by rotating the x and y axes counterclockwise through an angle .

  4. List of mathematic operators - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematic_operators

    In mathematics, an operator or transform is a function from one space of functions to another. Operators occur commonly in engineering, physics and mathematics. Many are integral operators and differential operators.

  5. Equation xy = yx - Wikipedia

    en.wikipedia.org/wiki/Equation_xy_=_yx

    "x^y = y^x - commuting powers". Arithmetical and Analytical Puzzles. Torsten Sillke. Archived from the original on 2015-12-28. dborkovitz (2012-01-29). "Parametric Graph of x^y=y^x". GeoGebra. OEIS sequence A073084 (Decimal expansion of −x, where x is the negative solution to the equation 2^x = x^2)

  6. X/Y - Wikipedia

    en.wikipedia.org/wiki/X/Y

    X/Y is a 2014 American drama film written and directed by Ryan Piers Williams and starring America Ferrera, Ryan Piers Williams, Melonie Diaz, Jon Paul Phillips, Amber Tamblyn, David Harbour, and Common. [1] [2] The film premiered at the Tribeca Film Festival on April 19, 2014. [3]

  7. Relation (mathematics) - Wikipedia

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

    (x,y) ∈ R div. A path from x to y exists in the Hasse diagram representing R div. An edge from x to y exists in the directed graph representing R div. In the Boolean matrix representing R div, the element in line x, column y is "". As another example, define the relation R el on R by x R el y if x 2 + xy + y 2 = 1.

  8. X + Y sorting - Wikipedia

    en.wikipedia.org/wiki/X_+_Y_sorting

    [1] [3] A variant of the problem sorts the sumset , the set of sums of pairs, with duplicate sums condensed to a single value. For this variant, the size of the sumset may be significantly smaller than n 2 {\displaystyle n^{2}} , and output-sensitive algorithms for constructing it have been investigated.

  9. 15 and 290 theorems - Wikipedia

    en.wikipedia.org/wiki/15_and_290_theorems

    For example, x 2 + xy + y 2 is integral but does not have integral matrix. A positive integral quadratic form taking all positive integers as values is called universal. The 15 theorem says that a quadratic form with integer matrix is universal if it