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Permanent of the laplacian matrix of trees with a given matching

โœ Scribed by John L Goldwasser


Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
715 KB
Volume
61
Category
Article
ISSN
0012-365X

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โœฆ Synopsis


We define the Laplacian ratio of a tree z(T), to be the permanent of the Laplacian matrix of T divided by the product of the degrees of the vertices. Best possible lower and upper bounds are obtained for ~r(T) in terms of the size of the largest matching in T.


๐Ÿ“œ SIMILAR VOLUMES


Permanent of the Laplacian matrix of tre
โœ Richard A Brualdi; John L Goldwasser ๐Ÿ“‚ Article ๐Ÿ“… 1984 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 805 KB

be the Laplacian matrix of G. When G is a tree or a bipartite graph we obtain bounds for the permanent of L(G) both in terms of n only and in terms of d 1 ..... d,. Improved bounds are obtained in terms of the diameter of T and the size of a matching in T.

The kth Laplacian eigenvalue of a tree
โœ Ji-Ming Guo ๐Ÿ“‚ Article ๐Ÿ“… 2006 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 102 KB

## Abstract Let ฮป~__k__~(__G__) be the __k__th Laplacian eigenvalue of a graph __G__. It is shown that a tree __T__ with __n__ vertices has $\lambda\_{k}(T)\le \lceil { {n}\over{k}}\rceil$ and that equality holds if and only if __k__ < __n__, __k__|__n__ and __T__ is spanned by __k__ vertex disjoin

The Permanent Rank of a Matrix
โœ Yang Yu ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 91 KB

Define the perrank of a matrix A to be the size of the largest square submatrix of A with nonzero permanent. Motivated in part by the Alon Jaeger Tarsi Conjecture [3], we prove several results on perranks..

The enumeration of trees with and withou
โœ Taojun Lu ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 720 KB

A limb of a tree is the union of one or more branches at a vertex in the tree, where a branch of a tree at a vertex is a maximal subtree containing the given vertex as an end-vertex. In this note, we first consider the enumeration of trees (undirected, oriented or mixed) with forbidden limbs. The en