Dimension of Null Spaces with Applications to Group Rings
1978 ◽
Vol 30
(02)
◽
pp. 289-300
◽
Keyword(s):
In this paper we investigate methods for estimating the dimension of the null space of operators in a finite W* algebra, the dimension being measured by the trace τ. For the most part we are concerned with operators A which are a finite linear combination of orthogonal unitaries. We give various results which show how certain information about the unitaries and the coefficients can be utilized to derive an upper bound for τ(N A ) where NA is the null space of A.
Keyword(s):
1991 ◽
Vol 43
(2)
◽
pp. 241-250
◽
1960 ◽
Vol 56
(4)
◽
pp. 322-328
◽
2014 ◽
Vol 10
(06)
◽
pp. 1395-1420
◽
1980 ◽
pp. 223-233
2012 ◽
Vol 15
◽
pp. 444-462
1969 ◽
Vol 10
(3-4)
◽
pp. 335-340
Keyword(s):
2006 ◽
Vol 04
(03)
◽
pp. 559-565
◽