= Ontological model of a quantum system
{title2=$\mu_\psi(\lambda),\xi_j(\lambda)$}
An ontological model associates each <quantum state preparation> with a <probability distribution> over underlying physical states $\lambda$. A <quantum measurement>'s response probabilities depend on its specification and $\lambda$, sum to one, and reproduce the <Born rule> when averaged over the preparation distribution. The model need not assign deterministic outcomes. Overlap or disjointness of preparation measures defines the <psi-epistemic model> versus <psi-ontic model> distinction.
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