Vol. 12, No. 2, 2018

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ISSN: 1944-7833 (e-only)
ISSN: 1937-0652 (print)
On a conjecture of Kato and Kuzumaki

Diego Izquierdo

Vol. 12 (2018), No. 2, 429–454
Abstract

In 1986, Kato and Kuzumaki stated several conjectures in order to give a diophantine characterization of cohomological dimension of fields in terms of projective hypersurfaces of small degree and Milnor K-theory. We establish these conjectures for finite extensions of (x1,,xn) and (x1,,xn)((t)), and we prove new local-global principles over number fields and global fields of positive characteristic in the context of Kato and Kuzumaki’s conjectures.

Keywords
Cohomological dimension of fields, $C_i$ property, Milnor K-theory, Number fields, Function fields
Mathematical Subject Classification 2010
Primary: 11E76
Secondary: 12E25, 12E30, 14G27, 19D45, 19F99
Milestones
Received: 8 June 2017
Revised: 23 October 2017
Accepted: 18 December 2017
Published: 13 May 2018
Authors
Diego Izquierdo
Département de Mathématiques et Applications
École Normale Supérieure - CNRS, PSL Research University
Paris
France