An algebraic framework systematically characterizes the asymptotic dispersion of all multi-block non-Hermitian degeneracies, including n-bolical points and exceptional points of various orders.
Kurosh,Higher Algebra(Mir Publishers, Moscow, 1972)
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Characterizing all non-Hermitian degeneracies using algebraic approaches: Defectiveness and asymptotic behavior
An algebraic framework systematically characterizes the asymptotic dispersion of all multi-block non-Hermitian degeneracies, including n-bolical points and exceptional points of various orders.