Let $M$ be a 2 by 2 full matrix. $\phi$ is a state on $M$ with density $(\beta, 1-\beta)$, then we can find only one projection $e\in M$ with $\|\phi_{eM(1-e)}\|=|1-2\beta|$.
How to choose the projection $e$?
2026-04-12 23:11:24.1776035484
the norm of a state on the full matrix
40 Views Asked by user63181 https://math.techqa.club/user/user63181/detail AtRelated Questions in OPERATOR-THEORY
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