In his second notebook, Ramanujan recorded altogether 23 P –Q modular equa- tions involving his theta functions. In this paper, we establish several new mixed modular equa- tions involving Ramanujan's theta-functions . and ψ which are akin to those recorded in his notebook.
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机译：在他的第二本笔记本中，Ramanujan总共记录了涉及他的theta函数的23 P –Q模块化方程。在本文中，我们建立了几个涉及Ramanujan的theta函数的新的混合模块化方程。和ψ，类似于笔记本上记录的那些。
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