Zhou's orthogonality relation for Maass forms on GL(n)
Fix n≥2n\geq 2n≥2. Let {ϕj}j=1,2,…\{\phi_j\}_{j=1,2,\ldots}{ϕj}j=1,2,… be an orthogonal basis of Maass cusp forms for SL(n,Z)\operatorname{SL}(n,\mathbb Z)SL(n,Z), with Langlands parameters α(j)\alpha^{(j)}α(j) and normali…