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- W3098524906 abstract "A pseudo $(v,, k,, la)$-design is a pair $(X, {cal B})$ where $X$ is a $v$-set and ${cal B}={B_1,...,B_{v-1}}$ is a collection of $k$-subsets (blocks) of $X$ such that each two distinct $B_i, B_j$ intersect in $la$ elements; and $0lela <k le v-1$. We use the notion of pseudo designs to characterize graphs of order $n$ whose (adjacency) spectrum contains a zero and $pmtheta$ with multiplicity $(n-3)/2$ where $0<thetalesqrt{2}$. Meanwhile, partial results confirming a conjecture of O. Marrero on characterization of pseudo $(v,, k,, la)$-designs are obtained." @default.
- W3098524906 created "2020-11-23" @default.
- W3098524906 creator A5008547727 @default.
- W3098524906 date "2011-12-03" @default.
- W3098524906 modified "2023-10-14" @default.
- W3098524906 title "Bipartite graphs with five eigenvalues and pseudo designs" @default.
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- W3098524906 doi "https://doi.org/10.1007/s10801-011-0331-3" @default.
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