Electronic Resource
Springer
Aequationes mathematicae
25 (1982), S. 257-268
ISSN:
1420-8903
Keywords:
Primary 05C55
;
Secondary 15A18
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mathematics
Notes:
Abstract Some new constructions for families of cospectral graphs are derived, and some old ones are considerably generalized. One of our new constructions is sufficiently powerful to produce an estimated 72% of the 51039 graphs on 9 vertices which do not have unique spectrum. In fact, the number of graphs of ordern without unique spectrum is believed to be at leastαn 3 g −1 for someα〉0, whereg n is the number of graphs of ordern andn ≥ 7.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02189621
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