1,4

The ultraconnected graphs are related to the positive definite matrix completion problem.

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.

Sequence in context: A047092 A064228 A058130 this_sequence A048774 A061213 A063458

Adjacent sequences: A046079 A046080 A046081 this_sequence A046083 A046084 A046085

hard,nonn

Jason Grout (grout(AT)math.byu.edu), May 07 2003