نتایج جستجو برای: regular and strongly regular relations

تعداد نتایج: 16866236  

Journal: :Linear Algebra and its Applications 1982

Journal: :Journal of Combinatorial Theory, Series A 2012

2005
Chih-wen Weng

Let Γ = (X, R) denote a distance-regular graph with distance function ∂ and diameter d ≥ 3. For 2 ≤ i ≤ d, by a parallelogram of length i, we mean a 4-tuple xyzu of vertices in X such that ∂(x, y) = ∂(z, u) = 1, ∂(x, u) = i, and ∂(x, z) = ∂(y, z) = ∂(y, u) = i − 1. Suppose the intersection number a1 = 0, a2 6= 0 in Γ. We prove the following (i)-(ii) are equivalent. (i) Γ is Q-polynomial and con...

Journal: :European Journal of Combinatorics 2001

Journal: :Linear Algebra and its Applications 2008

Journal: :Journal of Combinatorial Theory, Series A 1988

Journal: :Proceedings of the Japan Academy, Series A, Mathematical Sciences 1970

Journal: :Proceedings of the Japan Academy, Series A, Mathematical Sciences 1964

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