Absolute PPT spectra form a spectrahedron with exposed faces, a kernel-rank facial calculus, and an inscribed polytope that gives tight bounds on purity, entropy, and relative volume.
Positive partial transpose from spectra,
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The geometry of absolute separability and other convex matrix properties from spectrum
Absolute PPT spectra form a spectrahedron with exposed faces, a kernel-rank facial calculus, and an inscribed polytope that gives tight bounds on purity, entropy, and relative volume.