Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galois sections for abelianized fundamental groups   Given a smooth projective curve $X$ of genus at least 2 over a number field
$k$, Grothendieck's Section Conjecture predicts that the canonical projection
from the \'etale fundamental group of $X$ onto the absolute Galois group of $k$
has a section if and only if the curve has a rational point. We show that there
exist curves where the above map has a section over each completion of $k$ but
not over $k$. In the appendix Victor Flynn gives explicit examples in genus 2.
  Our result is a consequence of a more general investigation of the existence
of sections for the projection of the \'etale fundamental group `with
abelianized geometric part' onto the Galois group. We give a criterion for the
existence of sections in arbitrary dimension and over arbitrary perfect fields,
and then study the case of curves over local and global fields more closely. We
also point out the relation to the elementary obstruction of
Colliot-Th\'el\`ene and Sansuc.

37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat