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  2. Sales taxes in Canada - Wikipedia

    https://en.wikipedia.org/wiki/Sales_taxes_in_Canada

    Separate provincial sales taxes (PST) are collected in the provinces of British Columbia, Saskatchewan, Manitoba (retail sales tax or RST) and Quebec (Quebec sales tax or QST, French: Taxe de vente du Québec or TVQ).

  3. Ackermann function - Wikipedia

    https://en.wikipedia.org/wiki/Ackermann_function

    This inverse appears in the time complexity of some algorithms, such as the disjoint-set data structure and Chazelle's algorithm for minimum spanning trees. Sometimes Ackermann's original function or other variations are used in these settings, but they all grow at similarly high rates.

  4. Inverse function - Wikipedia

    https://en.wikipedia.org/wiki/Inverse_function

    Sometimes, this multivalued inverse is called the full inverse of f, and the portions (such as √ x and − √ x) are called branches. The most important branch of a multivalued function (e.g. the positive square root) is called the principal branch , and its value at y is called the principal value of f −1 ( y ) .

  5. Integral transform - Wikipedia

    https://en.wikipedia.org/wiki/Integral_transform

    Employing the inverse transform, i.e., the inverse procedure of the original Laplace transform, one obtains a time-domain solution. In this example, polynomials in the complex frequency domain (typically occurring in the denominator) correspond to power series in the time domain, while axial shifts in the complex frequency domain correspond to ...

  6. Thin plate spline - Wikipedia

    https://en.wikipedia.org/wiki/Thin_plate_spline

    Thin plate splines (TPS) are a spline-based technique for data interpolation and smoothing. "A spline is a function defined by polynomials in a piecewise manner." "A spline is a function defined by polynomials in a piecewise manner."

  7. Inverse trigonometric functions - Wikipedia

    https://en.wikipedia.org/wiki/Inverse_trigonometric...

    However, this might appear to conflict logically with the common semantics for expressions such as sin 2 (x) (although only sin 2 x, without parentheses, is the really common use), which refer to numeric power rather than function composition, and therefore may result in confusion between notation for the reciprocal (multiplicative inverse) and ...

  8. Involution (mathematics) - Wikipedia

    https://en.wikipedia.org/wiki/Involution_(mathematics)

    Any involution is a bijection.. The identity map is a trivial example of an involution. Examples of nontrivial involutions include negation (x ↦ −x), reciprocation (x ↦ 1/x), and complex conjugation (z ↦ z) in arithmetic; reflection, half-turn rotation, and circle inversion in geometry; complementation in set theory; and reciprocal ciphers such as the ROT13 transformation and the ...

  9. Fourier inversion theorem - Wikipedia

    https://en.wikipedia.org/wiki/Fourier_inversion_theorem

    In mathematics, the Fourier inversion theorem says that for many types of functions it is possible to recover a function from its Fourier transform.Intuitively it may be viewed as the statement that if we know all frequency and phase information about a wave then we may reconstruct the original wave precisely.