Hypergeometric Definition and 77 Threads

  1. T

    Solution of Airy's Equation in Terms of Gauss Hypergeometric Series

    Homework Statement Find the general solution of Airy's equation f'' - zf=0 satisfying the initial conditions f(0)=1, f'(0)=0 as a power series expansion at z=0. Express the result in terms of the Gauss hypergeometric series. The Attempt at a Solution After subbing...
  2. J

    Checking regular variance around 0, hypergeometric fucntion

    Homework Statement A function g is \alpha-regularly varying around zero if for all \lambda > 0, \lim_{x\to 0} \frac{g(\lambda x)}{g(x)}=\lambda^{\alpha} For real s and \alpha \in (0,1), define f: f(s)=1-\alpha \int_{0}^{\infty} e^{\alpha t}...
  3. M

    Calculating Hypergeometric Function 2F1 for |z|>1

    I posted this in the Advanced Physics forum as well, but it occurred to me that this might be a more appropriate place. I'd delete it in Advanced Physics, but I can't see where to do that. Homework Statement I'm need to integrate the function \frac{A}{(1+B^2x^2)^{\frac{C+1}{2}}} which...
  4. B

    Difficult integral involving hypergeometric function

    I am trying to calculate the following integral I=\int_0^\infty\frac{x}{(x+ia)^2} {\mbox{$_2$F$_1\!$}}\left(\frac{1}{2},b,\frac{3}{2},-\frac{x^2}{c^2}\right) dx. I tried several different ways but drew a complete blank. Is there a way of converting this nasty hypergeometric function into...
  5. D

    Probability question - balls in urn (hypergeometric?)

    Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn one by one without replacement. What is the probability that the last ball is black? This looks to me like it is a hypergeometric distribution...
  6. J

    Hypergeometric Distribution homework problem

    Homework Statement A large company employs 20 individuals as statisticians, 7 of whom are women and 13 of whom are men. No two people earn the same amount. What is the probability that 6 of the women earn salaries below the median salary of the group? Homework Equations If r is the...
  7. K

    Hypergeometric DE's & the Riemann P-function

    Apologies in advance for the TeX in this post, I'm new and having difficulty with the formatting. Homework Statement I'm trying to understand the logic my professor uses to derive a second linearly independent solution to the hypergeometric DE: z(1-z)\frac{d^2 w}{dz^2} + (\gamma - z(1+\alpha...
  8. B

    Difficult integral involving Hypergeometric functions

    Hey, I want to compute integrals of the following form I= \int_{-i \infty}^{i\infty} (1-x^2)^\frac{d-1}{2} \prod_{i=1}^4 _2F_1(a_i,b_i,c_i;\frac{1-x}{2}) dx where a_i,b_i,c_i are constants and c_i\in \mathbb{N}. d is a positive integer. For odd d I know that the integral will be zero by...
  9. P

    Integrals of product of hypergeometric functions

    Hello, I am wondering about integrals of the form \int_0^1 {}_p F_q(\{a_1,\ldots,a_p\},\{b_1,\ldots,b_q\},y){}_{p'} F_{q'}(\{a'_1,\ldots,a'_{p'}\},\{b'_1,\ldots,b'_{q'}\},y)dy integrals of product of hypergeometric functions. I know that if the limits of integration were +/-...
  10. R

    What is the probability that Mike Mouse will be included in the control group?

    Homework Statement Suppose 9 mice are available for a study of a possible carcinogen and 4 of them will form a control group (i.e. will not receive the substance). Assuming that a random sample of 4 mice are selected, what is the probability that a particular mouse, Mike Mouse will be included...
  11. X

    About a hypergeometric functions (2F1).

    Today, I use two softwares to calculate the value of a hypergeometric functions (2F1). One is Mathematica and another is Matlab. But they give me different results. For examples: (1) 2F1(0.5, 1., 1.5, 5) (Pay an attention to the sign of the image part.) Mathematica's result...
  12. S

    What is the notation for hypergeometric functions and what does it represent?

    Homework Statement I have seen some hypergeometric function in the form: 2F1=(a,b;c;d), Is there such thing as: 2F1=(a,b,c;d) Homework Equations The Attempt at a Solution I don't understand why sometimes we have a comma and sometimes we have a semi-colon. thank you
  13. B

    Hypergeometric Function around z=1/2

    Hello, for some calculation I need the behaviour of the hypergeometric function 2F1 near z=\tfrac{1}{2}. Specifically I need _2 F_1(\mu,1-\mu,k,\tfrac{1}{2}+i x) with x\in \mathbb{R} near 0, and 1/2\leq\mu\leq 2, 1\leq k \in \mathbb{N}. Differentiating around x=0 and writing the...
  14. A

    Hypergeometric identity proof using Pochhammer

    I'm trying to show that: F(a, b; z) = F(a-1, b; z) + (z/b) F(a, b+1 ; z) where F(a, b; z) is Kummer's confluent hypergeometric function and F(a, b; z) = SUMn=0[ (a)n * z^n ] / [ (b)n * n!] where (a)n is the Pochhammer symbol and is defined by: a(a+1)(a+2)(a+3)...(a+n-1)...
  15. S

    I desperately with hypergeometric functions.

    Homework Statement I have three problems on my homework set that I can't figure out. I'll start with the longest one: Show that by letting z=\zeta^{-1} and u=\zeta^{\alpha}v(\zeta) that the hypergeometric differential equation z(1-z)\frac {d^2u}{dz^2} + \left[\gamma-(\alpha+\beta+1)z...
  16. G

    What is the Hypergeometric Function for the Given Series?

    Homework Statement write the following serie in the form of hypergeometric function: f(x)=\sum\frac{(-1*(x^2))^n}{(2^n)(2n-1)(2n+1)(2n+3)} n changes from 0 to \infty Homework Equations hypergeometric function: The Attempt at a Solution guys i have thought about this for 2...
  17. B

    Can the Difference of Two Hypergeometric Functions be Expressed as One Term?

    Hello: I need to simplify the following if possible _2F_1(a,b;c;-x^2) - _2F_1(a+1,b+1;c+1;-x^2) In fact, a= 1/2 and c=3/2 and b>=1. In other words, the difference above that I am interested in is more specifically _2F_1(.5, b; 1.5; -x^2) - _2F_1(.5+1, b+1...
  18. R

    Connection between modified Bessel and hypergeometric fct's

    hallo, i now spent an hour looking for a formula connecting the modified bessel functions I_n and K_n to the hypergeometrical series F(a,b;c;z). has somedoby an idea? thank you
  19. W

    Solving Hypergeometric D.E. Heun Equation

    The Heun equation is a generalization of the hypergeometric D.E. to the case of four regular singular points. With the singular points at z=0,1,a,and inft, the Heun equation takes the form, z(z-1)(z-a)w''+(c_1*z^2+c_2*z+c_3)w'+(c_4*z+c_5)w=0 (a) In terms of k_1, k_2, k_3, k_4 and a...
  20. W

    Solving Hypergeometric D.E. w/ Heun Eq & Quadratic Accessory Parameter

    Homework Statement The Heun equation is a generalization of the hypergeometric D.E. to the case of four regular singular points. With the singular points at z=0,1,a,and inft, the Heun equation takes the form, z(z-1)(z-a)w''+(c_1*z^2+c_2*z+c_3)w'+(c_4*z+c_5)w=0 (a) In terms of k_1, k_2...
  21. E

    A Hypergeometric Distribution Problem

    Homework Statement Balls are randomly withdrawn, one at a time without replacement, from an urn that initially has N white and M black balls. Find the probability that n white balls are drawn before m black balls, n <= N, m <= M. Homework Equations A hypergeometric random variable with...
  22. P

    Hypergeometric distribution

    Hello, Im just wondering is there a simply calculated formula for the expected value and variance for the hypergeometric distribution. I know how to do it with long calculations. I know the expected value for the binomial is = np and the variance is = npq = np(1-p) .. Is there something like...
  23. D

    Hypergeometric transformations and identities

    How do you derive hypergeometirc identities of the form 2F1(a,b,c,z)= gamma function. What I mean is that the hypergeometric function converges to a set of gamme functions function in terms of (a,b,c) where z is not 1,-1, or 1/2 ? The hypergeometric identities in the mathworld summary...
  24. G

    What is the formula for F(a, a+1/2, 3/2, z^2) and its general form?

    How would i go about showing the special case F(1, b, b; x) of the hypergeometic function is the geometric series and also how the geometric series is = 1/ (1 -x) Cheers, Dave
  25. P

    MOdular Hypergeometric Sieve and Parallel Processing

    [Note: P and p throughout are probabilities] Fact: The hypergeometric distribution is the precise probability of crawing from a dichotomous (S-F) population without replacement. A family of probabilistic sieves can be constructed using this fact as follows. Step 1: Suppose we know all...
  26. W

    I'm not sure if I understand the question - please clarify!

    I am having trouble with a problem that asks me to show that if I change the variable of integration of the following equation from t to t-1 the following http://mathworld.wolfram.com/images/equations/EulersHypergeometricTransformations/equation1.gif (disregard that z in the denominator, that...
  27. I

    A Proof on hypergeometric distribution

    Show directly that the set of probabilities associated with the hypergeometric distribution sum to one. => I am thinking that this tells me to prove that since this is a probability distribution function, it really should sum to 1. Is that what the problem asking me to do? =) I got...
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