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  2. Q-function - Wikipedia

    en.wikipedia.org/wiki/Q-function

    This expression is valid only for positive values of x, but it can be used in conjunction with Q(x) = 1 − Q(−x) to obtain Q(x) for negative values. This form is advantageous in that the range of integration is fixed and finite.

  3. Laplace transform - Wikipedia

    en.wikipedia.org/wiki/Laplace_transform

    In mathematics, the Laplace transform, named after Pierre-Simon Laplace (/ l ə ˈ p l ɑː s /), is an integral transform that converts a function of a real variable (usually , in the time domain) to a function of a complex variable (in the complex-valued frequency domain, also known as s-domain, or s-plane).

  4. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    First, we multiply A with the Householder matrix Q 1 we obtain when we choose the first matrix column for x. This results in a matrix Q 1 A with zeros in the left column (except for the first row). Q 1 A = [ α 1 ⋆ ⋯ ⋆ 0 ⋮ A ′ 0 ] {\displaystyle Q_{1}A={\begin{bmatrix}\alpha _{1}&\star &\cdots &\star \\0&&&\\\vdots &&A'&\\0&&&\end ...

  5. Delta potential - Wikipedia

    en.wikipedia.org/wiki/Delta_potential

    Source: [1] The potential splits the space in two parts (x < 0 and x > 0).In each of these parts the potential is zero, and the Schrödinger equation reduces to =; this is a linear differential equation with constant coefficients, whose solutions are linear combinations of e ikx and e −ikx, where the wave number k is related to the energy by =.

  6. Legendre polynomials - Wikipedia

    en.wikipedia.org/wiki/Legendre_polynomials

    When n is an integer, the solution P n (x) that is regular at x = 1 is also regular at x = −1, and the series for this solution terminates (i.e. it is a polynomial). The orthogonality and completeness of these solutions is best seen from the viewpoint of Sturm–Liouville theory .

  7. Padé approximant - Wikipedia

    en.wikipedia.org/wiki/Padé_approximant

    For given x, Padé approximants can be computed by Wynn's epsilon algorithm [2] and also other sequence transformations [3] from the partial sums = + + + + of the Taylor series of f, i.e., we have = ()!. f can also be a formal power series, and, hence, Padé approximants can also be applied to the summation of divergent series.

  8. Weibull distribution - Wikipedia

    en.wikipedia.org/wiki/Weibull_distribution

    For k > 1, the density function tends to zero as x approaches zero from above, increases until its mode and decreases after it. The density function has infinite negative slope at x = 0 if 0 < k < 1, infinite positive slope at x = 0 if 1 < k < 2 and null slope at x = 0 if k > 2. For k = 1 the density has a finite negative slope at x = 0.

  9. Physical symbol system - Wikipedia

    en.wikipedia.org/wiki/Physical_symbol_system

    Newell and Simon carried out psychological experiments that showed that, for difficult problems in logic, planning, or any kind of "puzzle solving", people carefully proceeded step-by-step, considering several different possible ways forward, selected the most promising one, backing up when the possibility hit a dead end. Each possible solution ...

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