Generators and relations for the etale fundamental group

Details Generators and relations for the etale fundamental group Generators and relations for the etale fundamental group

2007-03-06

arxiv.org/abs/math/0703139v3

Mathematics

Algebraic Geometry

26 pages. Significant revision; errors corrected, various points clarified

Scientific paper

If $C$ is a smooth curve over an algebraically closed field $k$ of characteristic $p$, then the structure of the maximal prime to $p$ quotient of the \'etale fundamental group is known by analytic methods. In this paper, we discuss the properties of the fundamental group that can be deduced by purely algebraic techniques. We describe a general reduction from an arbitrary curve to the projective line minus three points, and show what can be proven unconditionally about the maximal pro-nilpotent and pro-solvable quotients of the prime-to-$p$ fundamental group. Included is an appendix which treats the tame fundamental group from a stack-theoretic perspective.

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