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math.AG2002
Ramification of surfaces: Artin-Schreier extensions
Igor Zhukov
Let be a regular 2-dimensional local ring of characteristic , and let be a cyclic extension of degree of its field of fractions such that the corresponding branc…
math.AG2002
Ramification of surfaces: sufficient jet order for wild jumps
Igor Zhukov
We develop a new approach to construction of numerical invariants for ramified coverings of algebraic surfaces of prime characteristic. Let A be a two-dimensional regular local rin…