A decomposition of Hilbert space into invariant subspaces for two orthogonal projections yields finite-dimensional approximations and explicit bounds on the spectral radius of [P,Q] that are tight in the constant-angle one-shifted case.
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Estimating the spectral radius of Bell-type operator via finite dimensional approximation of orthogonal projections
A decomposition of Hilbert space into invariant subspaces for two orthogonal projections yields finite-dimensional approximations and explicit bounds on the spectral radius of [P,Q] that are tight in the constant-angle one-shifted case.