Abstract
The behaviour of degenerate eigenvalues in Hückel systems is investigated under insertion of an additional bond or an additional centre. In the first case the degeneracy of any given eigenvalue is reduced by not more than two, in the second case by not more than one.
References
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Wild, U.P. Degenerate eigenvalues of the Hückel matrix. Theoret. Chim. Acta 54, 245–249 (1979). https://doi.org/10.1007/BF00578343
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DOI: https://doi.org/10.1007/BF00578343