Rigidity for F_4(p)
arXiv:1511.06871 · doi:10.1016/j.aim.2016.07.015
Abstract
We prove the existence of certain rationally rigid triples in F_4(p) for good primes p (i.e., p>3), thereby showing that these groups occur as regular Galois groups over Q(t) and so also over Q. We show that these triples give rise to rigid triples in the algebraic group and prove that they generate an interesting subgroup in characteristic 0.
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