Automorphisms of perfect power series rings
classification
🧮 math.RA
math.NT
keywords
automorphismsperfectpowerringseriesanswerscharacteristiccontinuous
read the original abstract
Let R be a perfect ring of characteristic p. We show that the group of continuous R-linear automorphisms of the perfect power series ring over R is generated by the automorphisms of the ordinary power series ring together with Frobenius; this answers a question of Jared Weinstein.
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