Finite-dimensional observable algebras are Kochen-Specker noncontextual exactly when a flat context connection exists on their maximal extension, equivalently when the associated orthogonality graph is d-colourable.
Necessa ry and sufficient condi- tion for state-independent contextual measurement scenar ios
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Coming full circle -- A unified framework for Kochen-Specker contextuality
Finite-dimensional observable algebras are Kochen-Specker noncontextual exactly when a flat context connection exists on their maximal extension, equivalently when the associated orthogonality graph is d-colourable.