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A Short Note on the Higher Level Version of the Krull–Baer Theorem
Published online by Cambridge University Press: 20 November 2018
Abstract
Klep and Velušček generalized the Krull–Baer theorem for higher level preorderings to the non-commutative setting. A $n$-real valuation
$v$ on a skew field
$D$ induces a group homomorphism
$\overline{v}$. A section of
$\overline{v}$ is a crucial ingredient of the construction of a complete preordering on the base field
$D$ such that its projection on the residue skew field
${{k}_{v}}$ equals the given level 1 ordering on
${{k}_{v}}$. In the article we give a proof of the existence of the section of
$\overline{v}$, which was left as an open problem by Klep and Velušček, and thus complete the generalization of the Krull–Baer theorem for preorderings.
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- Copyright © Canadian Mathematical Society 2011