3 papers
math.OA2012
Positive combinations of projections in von Neumann algebras and purely infinite simple C*-algebras
V. Kaftal, P. W. Ng, S. Zhang
We give an overview of the question: which positive elements in an operator algebra can be written as a linear combination of projections with positive coefficients. A special case…
math.FA2012
Majorization and arithmetic mean ideals
V. Kaftal, G. Weiss
Following "An infinite dimensional Schur-Horn theorem and majorization theory", Journal of Functional Analysis 259 (2010) 3115-3162, this paper further studies majorization for inf…
math.FA2007
Soft ideals and arithmetic mean ideals
Victor Kaftal, Gary Weiss
This article investigates the soft-interior and the soft-cover of operator ideals. These operations, and especially the first one, have been widely used before, but making their ro…