The second Dirichlet eigenvalue is simple on every non-equilateral triangle, Part ii: Nearly equilateral triangles

Ryoki Endo, Xuefeng Liu. The second Dirichlet eigenvalue is simple on every non-equilateral triangle, Part ii: Nearly equilateral triangles. Numerische Mathematik, 158(3):1015-1047, June 2026. [doi]

Abstract

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