Source: Dissertation Abstracts International, Volume: 79-11(E), Section: B.
Advisors: Leslie Hogben Committee members: Steve Butler; Elgin Johnston; Bernard Lidicky; Sung-Yell Song.
Özet:
For a simple graph G=(V,E), S+(G) denote the set of real positive semidefinite matrices A=(aij) such that A=aij ≠ 0 if { i, j} ∈ E, aij = 0 if {i,j}∉ E, and a ii is any real number. The maximum positive semidefinite nullity of G, denoted M+(G), is max{null( A)