Article,

Rectifying a misbelief: Frank Harary's role in the discovery of the coefficient-theorem in chemical graph theory

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Journal of Mathematical Chemistry, 16 (1): 73--78 (1994)
DOI: 10.1007/BF01169197

Abstract

It is shown that the formula relating the coefficients of the characteristic polynomial of a graphG to certain structural features ofG (which in mathematical chemistry is traditionally referred to as the Sachs theorem) is a straightforward and relatively easily inferable corollary of an earlier result by Frank Harary.

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