2026/06/14 by Taiwang Deng, Dongsheng Wu
Mathematics · #math.NT
This paper revisits the functional equation of the symmetric-square L-function from the perspective of trace formulas. We show that, for level-one holomorphic cusp forms and even Hecke--Maass cusp forms, this symmetry can be recovered directly from the Petersson and Kuznetsov trace formulas. Although the functional equation itself is classical, our aim is to provide a concrete and transparent example of how the analytic structure of an L-function can emerge from a comparison of the spectral and geometric sides of a trace formula. The argument leads to an averaged reciprocity identity and treats the holomorphic and Maass settings within the same general framework. In this way, the paper offers a simple model for extending trace-formula methods beyond standard L-functions.