Abstract
The quantum problem of three impenetrable particles of arbitrary mass confined to a ring is solved by the Bethe ansatz. The solution of this problem is intimately related to the solution a Helmholtz equation in the interior of an arbitrary acute triangle, a problem thought insoluble by Bethe ansatz methods.
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McGuire, J.B., Dirk, C. Extending the Bethe Ansatz: The Quantum Three-Particle Ring. Journal of Statistical Physics 102, 971–980 (2001). https://doi.org/10.1023/A:1004815406443
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DOI: https://doi.org/10.1023/A:1004815406443