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2008
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14 years 18 days ago
On association schemes all elements of which have valency 1 or 2
In the present note, we investigate schemes S in which each element s satisfies ns 2 and nss = 2. We show that such a scheme is schurian. More precisely, we show that it is isomor...
Mikhail E. Muzychuk, Paul-Hermann Zieschang