Structure of regular complete local rings (Cohen structure theorem) Higher ramification groups of cyclotomic extensions Higher ramification groups with inseparable residue fields p^n cyclic extensions in characteristic p via Witt vectors Proof of Hasse-Arf theorem Introduction to etale fundamental groups Torsors under elliptic curves Etale cohomology as generalization of Galois cohomology Lifting extensions of k[x] from characteristic p to characteristic 0
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