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cc-by-nc-nd (c) Elsevier, 2021
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/195443

Any three eigenvalues do not determine a triangle

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Despite the moduli space of triangles being three dimensional, we prove the existence of two triangles which are not isometric to each other for which the first, second and fourth Dirichlet eigenvalues coincide, establishing a numerical observation from Antunes-Freitas [1]. The two triangles are far from any known, explicit cases. To do so, we develop new tools to rigorously enclose eigenvalues to a very high precision, as well as their position in the spectrum. This result is also mentioned as (the negative) part of [35, Conjecture 6.46], [23, Open Problem 1] and [39, Conjecture 3].

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GÓMEZ SERRANO, Javier and ORRIOLS, Gerard. Any three eigenvalues do not determine a triangle. Journal of Differential Equations. 2021. Vol. 275, num. 920-938. ISSN 0022-0396. [consulted: 22 of May of 2026]. Available at: https://hdl.handle.net/2445/195443

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