Note on the Coulson integral formula |
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Authors: | Ivan Gutman Miodrag Mateljević |
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Institution: | (1) Faculty of Science, University of Kragujevac, P.O. Box 60, 34000 Kragujevac, Serbia & Montenegro;(2) Faculty of Mathematics, University of Belgrade, Studentski Trg 16, 11000 Belgrade, Serbia & Montenegro |
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Abstract: | Let P be a polynomial of degree n, whose zeros λ1, λ2, ..., λ
n
are real-valued. The Coulson integral formula (first reported in 1940) is an expression for the sum of the positive–valued
zeros of P, in terms of P. We show that the Coulson formula holds if and only if the condition λ1+λ2+...+λ
n
=0 is obeyed. We also show how the formula has to be modified, so that it be applicable in the case when λ1+λ2+...+λ
n
≠ 0.
Ams Classification (2000): primary: 92E10, secondary: 32A27, 81Q99 |
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Keywords: | Coulson integral formula total π -electron energy HMO theory |
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