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math.FA2026
Completely Positive Matrix Products
Eric Evert, Michael T. Jury, Scott McCullough
The paper defines and characterizes JCP (completely positive) matrix products via the positivity of their associated Choi matrices and provides a Choi‑Kraus representation, then in…
math.FA2025
Determinants of Random Unitary Pencils
Michael T. Jury, George Roman
We investigate determinants of random unitary pencils (with scalar or matrix coefficients), which generalize the characteristic polynomial of a single unitary matrix. In particular…