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A presentation by generators and relations of Nichols algebras of diagonal type and convex orders on root systems

We obtain a presentation by generators and relations of any Nichols algebra of diagonal type with finite root system. We prove that the defining ideal is finitely generated. The proof is based in Kharchenko's theory of PBW basis of Lyndon words. We prove that the lexicographic order on Lyndon words is convex for such PBW generators and so the PBW basis is orthogonal with respect to the canonical non-degenerate form associated to the Nichols algebra.

preprint2010arXivOpen access
Iván Ezequiel Angiono
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Iván Ezequiel Angiono

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