Spectra of Hermitian triples A, B, A+B equal honeycomb boundary positions because both families satisfy the same four axioms (base, direct sum, convexity, splitting).
Eigenvalues of sums of Hermitian matrices
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Honeycombs and Sums of Hermitian Matrices, Revisited
Spectra of Hermitian triples A, B, A+B equal honeycomb boundary positions because both families satisfy the same four axioms (base, direct sum, convexity, splitting).