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  2. Equation xy = yx - Wikipedia

    en.wikipedia.org/wiki/Equation_xy_=_yx

    This equation describes the isocline curve where power functions have slope 1, analogous to the geometric property of = described above. The equation is equivalent to y y = x x , {\displaystyle y^{y}=x^{x},} as can be seen by raising both sides to the power x y . {\displaystyle xy.}

  3. Rotation of axes in two dimensions - Wikipedia

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

    A point P has coordinates (x, y) with respect to the original system and coordinates (x′, y′) with respect to the new system. [1] In the new coordinate system, the point P will appear to have been rotated in the opposite direction, that is, clockwise through the angle . A rotation of axes in more than two dimensions is defined similarly.

  4. Band (algebra) - Wikipedia

    en.wikipedia.org/wiki/Band_(algebra)

    zxyz = zyxz for all x, y, and z ∈ S. We can also say a normal band is a band S satisfying axyb = ayxb for all a, b, x, and y ∈ S. This is the same equation used to define medial magmas, so a normal band may also be called a medial band, and normal bands are examples of medial magmas. [3]

  5. Linear equation - Wikipedia

    en.wikipedia.org/wiki/Linear_equation

    Vertical line of equation x = a Horizontal line of equation y = b. Each solution (x, y) of a linear equation + + = may be viewed as the Cartesian coordinates of a point in the Euclidean plane. With this interpretation, all solutions of the equation form a line, provided that a and b are not both zero. Conversely, every line is the set of all ...

  6. Jordan algebra - Wikipedia

    en.wikipedia.org/wiki/Jordan_algebra

    In 1932, Jordan attempted to axiomatize quantum theory by saying that the algebra of observables of any quantum system should be a formally real algebra that is commutative (xy = yx) and power-associative (the associative law holds for products involving only x, so that powers of any element x are unambiguously defined). He proved that any such ...

  7. Notation for differentiation - Wikipedia

    en.wikipedia.org/wiki/Notation_for_differentiation

    Assume that (x, y, z) is a given Cartesian coordinate system, that A is a vector field with components = (,,), and that = (,,) is a scalar field. The differential operator introduced by William Rowan Hamilton , written ∇ and called del or nabla, is symbolically defined in the form of a vector,

  8. Talk:Equation xy = yx - Wikipedia

    en.wikipedia.org/wiki/Talk:Equation_xy_=_yx

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  9. Hyperbola - Wikipedia

    en.wikipedia.org/wiki/Hyperbola

    Thus, in an xy-coordinate system the graph of a function :, >, with equation =, >, is a rectangular hyperbola entirely in the first and third quadrants with the coordinate axes as asymptotes , the line y = x {\displaystyle y=x} as major axis ,