Abstract
For two-dimensional Coxeter systems with arbitrary multiplicities, a basis of the module of quasi-invariants over the invariants is explicitly constructed. It is proved that the basis thus obtained consists of m-harmonic polynomials. Hence this generalizes earlier results of Veselov and the author for systems of constant multiplicity.
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Feigin, M.V. Quasi-Invariants of Dihedral Systems. Mathematical Notes 76, 723–737 (2004). https://doi.org/10.1023/B:MATN.0000049671.38147.7e
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DOI: https://doi.org/10.1023/B:MATN.0000049671.38147.7e