On \(Q\)-polynomial association schemes of small class (Q426846)
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| Language | Label | Description | Also known as |
|---|---|---|---|
| English | On \(Q\)-polynomial association schemes of small class |
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On \(Q\)-polynomial association schemes of small class (English)
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12 June 2012
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Summary: We show an inequality involving the third largest or second smallest dual eigenvalues of \(Q\)-polynomial association schemes of class at least three. Also we characterize dual-tight \(Q\)-polynomial association schemes of class three. Our method is based on tridiagonal matrices and can be applied to distance-regular graphs as well.
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distance-regular graph
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Q-polynomial association scheme
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