Restrictions on the prime-to- $p$ fundamental group of a smooth projective variety

Publisher: Cambridge University Press

E-ISSN: 1570-5846|151|6|1083-1095

ISSN: 0010-437x

Source: Compositio Mathematica, Vol.151, Iss.6, 2015-06, pp. : 1083-1095

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Abstract

The goal of this paper is to obtain restrictions on the prime-to- $p$ quotient of the étale fundamental group of a smooth projective variety in characteristic $p\geqslant 0$ . The results are analogues of some theorems from the study of Kähler groups. Our first main result is that such groups are indecomposable under coproduct. The second result gives a classification of the pro- $\ell$ parts of one-relator groups in this class.