If A$A$ and B$B$ are two positive definite matrices such that norm A is less than equal to norm B$\|A\| \leq \|B\|$ for every unitarily invariant norm $\| \cdot \|$, and U be n*k$U$ is an $n\times k$ matrix and V be thewith adjoint of U$V$ such that VU=I_k$VU = I_k$, then can we establish some relation between trace VAU$\operatorname{trace}(VAU)$ and VBU.$\operatorname{trace}(VBU)$?
Michael Albanese
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