The integral graphs with index 3 and exactly two main eigenvalues
β Scribed by Zikai Tang; Yaoping Hou
- Book ID
- 104038351
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 416 KB
- Volume
- 433
- Category
- Article
- ISSN
- 0024-3795
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π SIMILAR VOLUMES
In this paper we determine all finite connected graphs whose spectiviri contains exactly two negative eigenvalues. The main theorem says that a graph hm exactly two negative eigenvalues if and only if its "canonical graph" (defined below) is one of nine particular graphs on 3, 4, 5 and G vertices.
The question whether there exist cubic graphs with two orbits and simple eigenvalues \*tJ;j is answered in the affirmative; the minimum number of vertices of such graphs is equal to 32.
We report on the first achievement of tunable two-band ``one-micron'' CW oscillation in the ^2^F~5/2~ β ^2^F~7/2~ channel of Yb^3+^ activator ions in Sc~2~O~3~ ceramics with CW laser-diode pumping, as well as on results of precise measurement of the refractive index and its dispersion in spectral ra