Decompositions for hypergeometric function $H_A, H_B,H_C$

Abstract: With the help of some techniques based on certain inverse pairs of symbolic operators, the authors investigated several decomposition formulas associated with Srivastava's Hypergeometric functions of three variables. Some operator identities have been constructed in this matter. With the help these operator forms 15 decompositions are found which are expressed through product of Hypergeometric Gauss and Appell's functions.