The criteria for the occurrence of a symmetric eigenvector in odd graphs are deduced; these confirm the validity of a recent assertion concerning the cause of such an eigenvector. The relationship to the Coulson–Rushbrooke Pairing Theorem is noted.
C. L. Honeybourne, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 34 DOI: 10.1039/F29767200034
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