Explicit subconvexity for $\mathrm{GL}_2$

We make the subconvex exponent for $\mathrm{GL}_2$ cuspidal representation in the work of Michel \& Venkatesh explicit. The result depends on an effective dependence on the `fixed' $\mathrm{GL}_2$ representation in our former work on the subconvex bounds for twists by Hecke characters, which in turn depends on the $\mathrm{L}^4$-norm of the test function.

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