International Journal of Mathematics and Mathematical Sciences
Volume 2004 (2004), Issue 57, Pages 3037-3043
doi:10.1155/S0161171204403615
Abstract
We will prove some inequalities among trigonometric quantities of
two and three operators. In particular, we will establish an
inequality among joint trigonometric quantities of two operators
and trigonometric quantities of each operator. As a corollary, we
will find an upper bound and a lower bound for the total joint
antieigenvalue of two positive operators in terms of the smallest
and largest eigenvalues of these operators.