Splitting Appell functions in terms of single quotients of theta functions

Abstract: Ramanujan's last letter to Hardy introduced the world to mock theta functions, and the mock theta function identities found in Ramanujan's lost notebook added to their intriguing nature. For example, we find the four tenth-order mock theta functions and their six identities. The six identities themselves are of a spectacular nature and were first proved by Choi. We also find over eight sixth-order mock theta functions in the lost notebook, but among their many identities there is only one relationship like those of the tenth-orders. Recently, three new identities for the sixth-order mock theta functions that are in the spirit of the six tenth-order identities were discovered. Here we present several families of tenth-order like identities for Appell functions, which are the building blocks of Ramanujan's mock theta functions.