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  2. Theta function - Wikipedia

    en.wikipedia.org/wiki/Theta_function

    There are several closely related functions called Jacobi theta functions, and many different and incompatible systems of notation for them. One Jacobi theta function (named after Carl Gustav Jacob Jacobi) is a function defined for two complex variables z and τ, where z can be any complex number and τ is the half-period ratio, confined to the upper half-plane, which means it has a positive ...

  3. Jacobi theta functions (notational variations) - Wikipedia

    en.wikipedia.org/wiki/Jacobi_theta_functions...

    Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Applied Mathematics Series. Vol. 55 (Ninth reprint with additional corrections of tenth original printing with corrections (December 1972); first ed.). Washington D.C.; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications.

  4. Ramanujan theta function - Wikipedia

    en.wikipedia.org/wiki/Ramanujan_theta_function

    In mathematics, particularly q-analog theory, the Ramanujan theta function generalizes the form of the Jacobi theta functions, while capturing their general properties. In particular, the Jacobi triple product takes on a particularly elegant form when written in terms of the Ramanujan theta. The function is named after mathematician Srinivasa ...

  5. Neville theta functions - Wikipedia

    en.wikipedia.org/wiki/Neville_theta_functions

    Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Applied Mathematics Series. Vol. 55 (Ninth reprint with additional corrections of tenth original printing with corrections (December 1972); first ed.). Washington D.C.; New York: United States Department of Commerce, National Bureau of Standards; Dover Publications.

  6. q-theta function - Wikipedia

    en.wikipedia.org/wiki/Q-theta_function

    In mathematics, the q-theta function (or modified Jacobi theta function) is a type of q-series which is used to define elliptic hypergeometric series. [ 1 ] [ 2 ] It is given by θ ( z ; q ) := ∏ n = 0 ∞ ( 1 − q n z ) ( 1 − q n + 1 / z ) {\displaystyle \theta (z;q):=\prod _{n=0}^{\infty }(1-q^{n}z)\left(1-q^{n+1}/z\right)}

  7. Stirling's approximation - Wikipedia

    en.wikipedia.org/wiki/Stirling's_approximation

    An alternative version uses the fact that the Poisson distribution converges to a normal distribution by the Central Limit Theorem. [5]Since the Poisson distribution with parameter converges to a normal distribution with mean and variance , their density functions will be approximately the same:

  8. Jacobi triple product - Wikipedia

    en.wikipedia.org/wiki/Jacobi_triple_product

    Showing that () = (the polynomial of x of is 1) is technical.One way is to set = and show both the numerator and the denominator of = = = (+ ())are weight 1/2 modular under , since they are also 1-periodic and bounded on the upper half plane the quotient has to be constant so that () = =.

  9. Mock modular form - Wikipedia

    en.wikipedia.org/wiki/Mock_modular_form

    George Andrews [14] showed that several of Ramanujan's fifth order mock theta functions are equal to quotients ⁠ Θ(𝜏) / θ(𝜏) ⁠ where θ(𝜏) is a modular form of weight ⁠ 1 / 2 ⁠ and Θ(𝜏) is a theta function of an indefinite binary quadratic form, and Dean Hickerson [15] proved similar results for seventh order mock theta ...