We give several bounds on the second smallest eigenvalue of the weighted Laplacian matrix of a finite graph and on the second largest eigenvalue of its weighted adjacency matrix. We establish relations between the given Cheeger-type bounds here and the known bounds in the literature. We show that one of our bounds is the best Cheeger-type bound available. (C) 2002 Wiley Periodicals, Inc.
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Fudan Univ, Sch Math Sci, LMNS, Shanghai 200433, Peoples R China
Fudan Univ, Shanghai Ctr Math Sci, Shanghai 200433, Peoples R ChinaFudan Univ, Sch Math Sci, LMNS, Shanghai 200433, Peoples R China
Hua, Bobo
Huang, Yan
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Fudan Univ, Sch Math Sci, Shanghai 200433, Peoples R ChinaFudan Univ, Sch Math Sci, LMNS, Shanghai 200433, Peoples R China