The Weyl bound for triple product L-functions

Let ${\pi }_1,{\pi }_2,{\pi }_3$ be three cuspidal automorphic representations for the group $\mathrm{S}\mathrm{L}(2,\mathbb{Z})$, where ${\pi }_1$ and ${\pi }_2$ are fixed and ${\pi }_3$ has large conductor. We prove a subconvex bound for $L(1/2, \pi_1 \otimes \pi_2 \otimes \pi_3)$ofWeyl-typequality\mathrm{.}Allowing$\pi_3$ to be an Eisenstein series we also obtain a Weyl-type subconvex bound for $L(1/2 + it, \pi_1 \otimes \pi_2)$.