Self maps of P^1 with prescribed ramification in characteristic p

Details Self maps of P^1 with prescribed ramification in characteristic p Self maps of P^1 with prescribed ramification in characteristic p

2004-07-26

arxiv.org/abs/math/0407445v1

Mathematics

Algebraic Geometry

20 pages. Contents of chapter I of PhD thesis, Massachusetts Institute of Technology, 2004

Scientific paper

Using limit linear series and a result controlling degeneration from separable maps to inseparable maps, we give a formula for the number of self-maps of the projective line with ramification to order e_i at general points P_i, in the case that all e_i are less than the characteristic. Unlike the case of characteristic 0, the answer is not given by Schubert calculus, nor is the number of maps always finite for distinct P_i, even in the tamely ramified case. However, finiteness for general P_i, obtained by exploiting the relationship to branched covers, is a key part of the argument.

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