Mathematics – Rings and Algebras
Scientific paper
2006-04-10
Mathematics
Rings and Algebras
22 pages. Corollary 4.9 has been corrected, as well as some misprints
Scientific paper
The action of the symmetric group of degree 4 on the Tetrahedron algebra,
introduced by Hartwig and Terwilliger, is studied. This action gives a grading
of the algebra which is related to its decomposition into a direct sum of three
subalgebras isomorphic to the Onsager algebra. The ideals of both the
Tetrahedron algebra and the Onsager algebra are determined.
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