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math.NT2009★ 3 cited
The place of exceptional covers among all diophantine relations
Michael D. Fried
A cover of normal varieties is exceptional over a finite field if the map on points over infinitely many extensions of the field is one-one. A cover over a number field is exceptio…
math.NT2001
Hurwitz monodromy, spin separation and higher levels of a modular tower
Paul Bailey, Michael D. Fried
Each finite -perfect group ( a prime) has a universal central -extension. For a perfect group these central extensions come from its {\sl Schur multiplier}. Serre gave…