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The stability index of a cactus

Published online by Cambridge University Press:  09 April 2009

Douglas D. Grant
Affiliation:
Department of Mathematics, University of Reading, England
D. A. Holton
Affiliation:
Department of Mathematics, University of MelbourneParkville 3052, Australia
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Abstract

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We show that if G is a connected graph of order n such that no line lies in more than one cycle (in other words, G is a cactus of order n), then the stability index of G is one of the integers 0, 1, n−7, n−6, n−5, n−4 or n.

Type
Research Article
Copyright
Copyright © Australian Mathematical Society 1977

References

Grant, D. D. (1974), “The stability index of graphs”, Proc. Second Australian Conference on Combinatorial Mathematics, Lecture Notes in Mathematics No. 403 (Springer-Verlag, Berlin), pp. 2952.CrossRefGoogle Scholar
Harary, F. (1969), Graph Theory (Addison-Wesley, Reading, Mass.).CrossRefGoogle Scholar
Heffernan, P. (1972), Trees (M.Sc. Thesis, University of Canterbury, New Zealand).Google Scholar
Holton, D. A. and Grant, D. D. (1975), “Regular graphs and stability”, J. Austral. Math. Soc. 20, (Ser. A), 377384.CrossRefGoogle Scholar
McAvaney, K. L. (1975), “Semi-stable and stable cacti”, J. Austral. Math. Soc. 20 (Ser. A), 419430.CrossRefGoogle Scholar
McAvaney, K. L., Grant, D. D. and Holton, D. A. (1974), “Stable and semi-stable unicyclic graphs”, Discrete Math. 9, 277288.CrossRefGoogle Scholar
Robertson, N. and Zimmer, J. A. (1972), “Automorphisms of subgroups obtained by deleting a pendant vertex”, J. Combinatorial Theory, Ser. B. 12, 169173.CrossRefGoogle Scholar