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  2. Lambert W function - Wikipedia

    en.wikipedia.org/wiki/Lambert_W_function

    The notation convention chosen here (with W 0 and W −1) follows the canonical reference on the Lambert W function by Corless, Gonnet, Hare, Jeffrey and Knuth. [3]The name "product logarithm" can be understood as follows: since the inverse function of f(w) = e w is termed the logarithm, it makes sense to call the inverse "function" of the product we w the "product logarithm".

  3. Lagrange inversion theorem - Wikipedia

    en.wikipedia.org/wiki/Lagrange_inversion_theorem

    The Lambert W function is the function () ... We may use the theorem to compute the Taylor series of () at = We take () = and = Recognizing that =, ...

  4. List of eponyms of special functions - Wikipedia

    en.wikipedia.org/wiki/List_of_eponyms_of_special...

    This is a list of special function eponyms in ... Paul Émile Appell (1855–1930): Appell hypergeometric series, ... Johann Heinrich Lambert: Lambert W function;

  5. Taylor series - Wikipedia

    en.wikipedia.org/wiki/Taylor_series

    In fact, the set of functions with a convergent Taylor series is a meager set in the Fréchet space of smooth functions. Even if the Taylor series of a function f does converge, its limit need not be equal to the value of the function f (x). For example, the function

  6. Log-normal distribution - Wikipedia

    en.wikipedia.org/wiki/Log-normal_distribution

    In particular, its Taylor formal series diverges: ... where is the Lambert W function. This approximation is derived via an asymptotic method, but it stays ...

  7. Generating function - Wikipedia

    en.wikipedia.org/wiki/Generating_function

    There are various types of generating functions, including ordinary generating functions, exponential generating functions, Lambert series, Bell series, and Dirichlet series. Every sequence in principle has a generating function of each type (except that Lambert and Dirichlet series require indices to start at 1 rather than 0), but the ease ...

  8. Wright omega function - Wikipedia

    en.wikipedia.org/wiki/Wright_Omega_Function

    The Wright omega function along part of the real axis. ... denoted ω, is defined in terms of the Lambert W function as: ... Its Taylor series around the point = ...

  9. Omega constant - Wikipedia

    en.wikipedia.org/wiki/Omega_constant

    It is the value of W(1), where W is Lambert's W function. The name is derived from the alternate name for Lambert's W function, the omega function. The numerical value of Ω is given by Ω = 0.56714 32904 09783 87299 99686 62210... (sequence A030178 in the OEIS). 1/Ω = 1.76322 28343 51896 71022 52017 76951... (sequence A030797 in the OEIS).