Integrals Involving H-function of Several Complex Variables

Transcription

1 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February Integrals Involving H-function of Several Complex Variables AshiqHussain Khan, Neelam Pandey Department of Mathematics Girls P. G College Rewa,(M.P) , INDIA Abstract- In this paper, the author presented certain integrals involving product of the multivariable H-function with exponential function, Gauss s hypergeometric function and Fox s function. The results derived here and basic in natural and many include a number of known and new results as particular cases. Index Terms- Hypergeometric function, Exponential function,h-function, Multivariable H-function. T I. INTRODUCTION he Gaussian hypergeometric function is of fundamental important in the theory of special functional. The important of this function lies in the first that most all of the commonly used function of applicable mathematics, mathematical physics, engineering and mathematical biology are expressible as its special cases. The series where is the Pochhammer symbol defined by (1) (2) is called the Gauss s hypergeometric series of the famous German mathematician Carl Friedrich Gauss ( ) who is the year 1812 introduced the series. It is represented by the symbol and is called the Gauss s hypergeometric function also. In 1961 Charles Fox [2] introduced a function which is more general then the Meijer s G-function and this function is well known in the literature of special function as Fox s H-function or simply the H-function. This function is defined and represented by means of the following Mellin-Barnes type contour integral where for convenience (3) (4) and is a suitable contour of the Mellin-Barnes type which runs from, separating the poles of from those of. An empty product is interpreted as unity the integers satisfy the inequalities ; the coefficients are positive real numbers, and the complex parameter are so constrained that no poles of the integrand coincide. Owing to the popularity of the special functions, those are defined in (1) and (3) (c.f [4],[3] and [5]), details regarding these are avoided. The H-functionof several complexvariables, defined H. M. Srivastava and R. Panda [5], by means of the following Mellian- Barnes type contour integral

2 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February where (5) where integers are constrained by the inequalities and ; ; are complex variable. is a suitable contour of the Mellien-Barnes type running from, in complex -plane. Details regarding existence conditions and various parametric restrictions ofh-function several complex variables. (6) II. REQUIRED RESULTS We shall require the following results in the sequel: The Mellin transform of the H-function follows from the definition (3) in view of the well-known Mellin inversion theorem. We have where (7) and. Lemma 2.1 From Rainville [4], we have (8) III. MAIN RESULTS In this section we have evaluated certain integrals involving product of the H-function several complex variables with exponential function, Gauss s hypergeometric function and Fox s H-function. Theorem 1:

3 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February where (9) provided (10) (i) (not both zero simultaneously) (ii) and are non-negative integers such that (iii) where (iv) Proof:

4 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February Now we replace with and express the hypergeometric function and H-function several complex variables with the help of (1) and (5) respectively, to get Now by using (8) the above result reduces to Interchanging the order of integration and summation, we obtain where is given by (10) On substituting in the inner -integral, the above expression reduces to

5 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February Finally, interpreting the contour integral by virtue of (5), we obtain Theorem 2:

6 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February provided (11) along with the sets of conditions (i) to (ii) given with theorem-1 and is given by (10). Theorem 3:, (12) provided such that,,

7 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February along with the sets of conditions (i) to (iii) given with theorem-1 and is given by (10). Theorem 4: (13) provided such that,, along with the sets of conditions (i) to (iii) given with theorem-1 and is given by (10). Theorem 5:

8 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February provided such that (14) along with the sets of conditions (i) to (iii) given with theorem-1 and is given by (10). Theorem 6:,

9 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February (15) provided such that,, along with the sets of conditions (i) to (iii) given with theorem-1and is given by (10). The integrals (11) to (15) can be proved on lines similar to those of integral (9) 1. Particular Cases Putting and in (9)(11)(12)(13)(14) and (15) the following known as well as new results may be realised: (i) Integral (9) reduces to the results: where, (16) (ii) Integral (11) reduces to the results:

10 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February where, (17) (iii) Integral (12) reduces to the results: where, (18) (iv) Integral (13) reduces to the results:

11 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February where, (19) (v) Integral (14) reduces to the results: (20) where, (vi) Integral (l5) leads to the result:

12 International Journal of Scientific and Research Publications, Volume 7, Issue 2, February where, (22) IV. CONCLUSION The H-function of several complex variables, presented in this paper, is quite basic in nature. Therefore, on specializing the parameters of this function, we may obtain various other special functions such as Fox s H-function, Meijer s G-function, Wright s generalized Bessel function, Wright s generalized hypergeometric function, Mac-Robert s E-function, generalized hypergeometric function, Bessel function of first kind, modified Bessel function, Whittaker function, exponential function, binomial function etc. as its special cases, and therefore, various unified integral presentations can be obtained as special cases of our results. REFERENCES [1] L. K. Arora and U. K. Saha, Integrals involving hypergeometric function and H-function J. India Acod. Math., 32(1)(2010), [2] C. Fox, The G and H- function as symmetrical Fourier kernel, Trans. Amer. Math. Soc., 98(1961), [3] A. M. Mathai and R. K. Saxena, The H-function with Application in Statistics and Other Disciplines, Wiley Eastern Limited, New Delhi, Bangalore, Bombay, (1978). [4] E. D. Rainville, Special Functions, Chelsea Publication Company, Bronx, New York, (1971). [5] H. M. Srivastava, K.C. Gupta and S. P. Goyal, The H-Functions of One and Two Variables with Applications, South Asian Publishers, New Delhi, Madras, (1982). AUTHORS First Author AshiqHussain Khan, Department of Mathematics Girls P. G College Rewa,(M.P) , INDIA, ashiqkhan509@gmail.com Second Author Neelam Pandey, Department of Mathematics Girls P. G College Rewa,(M.P) , INDIA