OFFSET
1,4
COMMENTS
The ultraconnected graphs are related to the positive definite matrix completion problem.
LINKS
W. W. Barrett, C. R. Johnson and R. Loewy, Critical graphs for the positive definite completion problem., SIAM J. Matrix Anal. Appl., Vol. 20 (1999), no. 1, 117-130.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Jason Grout (grout(AT)math.byu.edu), May 07 2003
EXTENSIONS
Broken link fixed by M. F. Hasler, Apr 05 2015
STATUS
approved