Reflection systems and partial root systems
Identifieur interne : 000268 ( Main/Exploration ); précédent : 000267; suivant : 000269Reflection systems and partial root systems
Auteurs : Ottmar Loos [Allemagne] ; Erhard Neher [Canada]Source :
- Forum Mathematicum [ 0933-7741 ] ; 2011-03.
English descriptors
- KwdEn :
- Abelian, Abelian group, Algebra, Axiom, Bilinear, Bilinear form, Canonical, Canonical projection, Cardinality, Central chain, Classical root systems, Closure, Coxeter, Coxeter group, Datum, Diff, Exact sequence, Extension data, Extension datum, Height function, Hyperplane, Imaginary roots, Integral basis, Integral system, Invariant form, Invariant forms, Isomorphic, Isomorphism, Lemma, Linear form, Loos, Lucas polynomials, Minimal type, Morphism, Neher, Nite, Nite rank, Nite root system, Nite root systems, Nondegenerate, Normal subsets, Other examples, Other hand, Partial, Partial root system, Partial root systems, Partial section, Positive roots, Positive subset, Positive subsets, Positive system, Positive systems, Prenilpotent, Prenilpotent pair, Prenilpotent pairs, Prs1, Prs2, Prs3, Quotient, Quotient root system, Real roots, Reine angew, Representation theory, Res1, Res2, Res3, Res4, Root, Root basis, Root data, Root string, Root string closure, Root strings, Root system, Root systems, Scalar type, Subgroup, Subset, Subsystem, Tind, Tit, Unbroken root strings, Unc1, Vector space, Vector space basis, Vector space isomorphism, Weyl, Weyl group, Weyl groups.
- Teeft :
- Abelian, Abelian group, Algebra, Axiom, Bilinear, Bilinear form, Canonical, Canonical projection, Cardinality, Central chain, Classical root systems, Closure, Coxeter, Coxeter group, Datum, Diff, Exact sequence, Extension data, Extension datum, Height function, Hyperplane, Imaginary roots, Integral basis, Integral system, Invariant form, Invariant forms, Isomorphic, Isomorphism, Lemma, Linear form, Loos, Lucas polynomials, Minimal type, Morphism, Neher, Nite, Nite rank, Nite root system, Nite root systems, Nondegenerate, Normal subsets, Other examples, Other hand, Partial, Partial root system, Partial root systems, Partial section, Positive roots, Positive subset, Positive subsets, Positive system, Positive systems, Prenilpotent, Prenilpotent pair, Prenilpotent pairs, Prs1, Prs2, Prs3, Quotient, Quotient root system, Real roots, Reine angew, Representation theory, Res1, Res2, Res3, Res4, Root, Root basis, Root data, Root string, Root string closure, Root strings, Root system, Root systems, Scalar type, Subgroup, Subset, Subsystem, Tind, Tit, Unbroken root strings, Unc1, Vector space, Vector space basis, Vector space isomorphism, Weyl, Weyl group, Weyl groups.
Abstract
We develop a general theory of reflection systems and, more specifically, partial root systems which provide a unifying framework for finite root systems, Kac–Moody root systems, extended affine root systems and various generalizations thereof. Nilpotent and prenilpotent subsets are studied in this setting, based on commutator sets and the descending central series. We show that our notion of a prenilpotent pair coincides, for Kac–Moody root systems, with the one defined by Tits in terms of positive systems and the Weyl group.
Url:
DOI: 10.1515/form.2011.013
Affiliations:
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Le document en format XML
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<front><div type="abstract" xml:lang="en">We develop a general theory of reflection systems and, more specifically, partial root systems which provide a unifying framework for finite root systems, Kac–Moody root systems, extended affine root systems and various generalizations thereof. Nilpotent and prenilpotent subsets are studied in this setting, based on commutator sets and the descending central series. We show that our notion of a prenilpotent pair coincides, for Kac–Moody root systems, with the one defined by Tits in terms of positive systems and the Weyl group.</div>
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