  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.
