On some new mixed modular equations involving Ramanujan's theta-functions
M. S. Mahadeva Naika, S. Chandankumar and M. Harish
Abstract
In his second notebook, Ramanujan recorded altogether 23 $P$--$Q$ modular equations involving his theta functions.
In this paper, we establish several new mixed modular equations involving Ramanujan's theta-functions $\varphi$ and $\psi$ which are akin to those
recorded in his notebook.