Rost invariant
id:
rost-invariant-255-17936503
title:
Rost invariant
text:
In mathematics, the Rost invariant is a cohomological invariant of an absolutely simple simply connected algebraic group G over a field k, which associates an element of the Galois cohomology group H3(k, Q/Z(2)) to a principal homogeneous space for G. Here the coefficient group Q/Z(2) is the tensor product of the group of roots of unity of an algebraic closure of k with itself. Markus Rost (1991) first introduced the invariant for groups of type F4 and later extended it to more general groups in
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wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Rost_invariant
date created:
date modified:
2018-05-16T12:55:26Z
main entity:
{"identifier":"Q17102845","url":"https://www.wikidata.org/entity/Q17102845"}
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fields total:
13
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