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    Paul Butterley, Anthony Sudbery & Jason Szulc (2006). Compatibility of Subsystem States. Foundations of Physics 36 (1):83-101.
    We examine the possible states of subsystems of a system of bits or qubits. In the classical case (bits), this means the possible marginal distributions of a probability distribution on a finite number of binary variables; we give necessary and sufficient conditions for a set of probability distributions on all proper subsets of the variables to be the marginals of a single distribution on the full set. In the quantum case (qubits), we consider mixed states of subsets of a set (...)
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