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Reduction argument from a general vertex set V(G) to a prime power in Prof. Keevash's proof on the Existence of Designs

The proof flow of the paper "On the Existence of Designs" by Prof. Keevash as I understand it is the following: -- Reduction from the general case to $V = \mathbb{F}_{p^a}$ (Lemma 6.3) -- Covering ...
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Known and unknown about Ramanujan's tau function

What is a good reference for open problems relating to the Ramanujan tau function? I know about Lehmer's conjecture. I know the following reductions of the problem: the smallest counterexample must ...