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  2. Translation operator (quantum mechanics) - Wikipedia

    en.wikipedia.org/wiki/Translation_operator...

    For each Bravais lattice vector we define a translation operator ^ which, when operating on any function () shifts the argument by : ^ = (+) Since all translations form an Abelian group, the result of applying two successive translations does not depend on the order in which they are applied, i.e. ^ ^ = ^ ^ = ^ + In addition, as the Hamiltonian ...

  3. Transformation (function) - Wikipedia

    en.wikipedia.org/wiki/Transformation_(function)

    A composition of four mappings coded in SVG, which transforms a rectangular repetitive pattern into a rhombic pattern. The four transformations are linear.. In mathematics, a transformation, transform, or self-map [1] is a function f, usually with some geometrical underpinning, that maps a set X to itself, i.e. f: X → X.

  4. Transformation matrix - Wikipedia

    en.wikipedia.org/wiki/Transformation_matrix

    In linear algebra, linear transformations can be represented by matrices.If is a linear transformation mapping to and is a column vector with entries, then there exists an matrix , called the transformation matrix of , [1] such that: = Note that has rows and columns, whereas the transformation is from to .

  5. Shift operator - Wikipedia

    en.wikipedia.org/wiki/Shift_operator

    Shift operators are examples of linear operators, important for their simplicity and natural occurrence. The shift operator action on functions of a real variable plays an important role in harmonic analysis, for example, it appears in the definitions of almost periodic functions, positive-definite functions, derivatives, and convolution. [2]

  6. Runge–Kutta methods - Wikipedia

    en.wikipedia.org/wiki/Runge–Kutta_methods

    The function r is called the stability function. [31] It follows from the formula that r is the quotient of two polynomials of degree s if the method has s stages. Explicit methods have a strictly lower triangular matrix A , which implies that det( I − zA ) = 1 and that the stability function is a polynomial.

  7. Translational symmetry - Wikipedia

    en.wikipedia.org/wiki/Translational_symmetry

    For translational invariant functions : it is () = (+).The Lebesgue measure is an example for such a function.. In physics and mathematics, continuous translational symmetry is the invariance of a system of equations under any translation (without rotation).

  8. Linear fractional transformation - Wikipedia

    en.wikipedia.org/wiki/Linear_fractional...

    [3] [4] The general procedure of combining linear fractional transformations with the Redheffer star product allows them to be applied to the scattering theory of general differential equations, including the S-matrix approach in quantum mechanics and quantum field theory, the scattering of acoustic waves in media (e.g. thermoclines and ...

  9. Translation (geometry) - Wikipedia

    en.wikipedia.org/wiki/Translation_(geometry)

    In classical physics, translational motion is movement that changes the position of an object, as opposed to rotation.For example, according to Whittaker: [1] If a body is moved from one position to another, and if the lines joining the initial and final points of each of the points of the body are a set of parallel straight lines of length ℓ, so that the orientation of the body in space is ...

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