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Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.
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The opposite category of commutative von Neumann algebras is not a topos because categorical products with a fixed object do not always preserve small colimits. See Theorem 6.4 in Andre Kornellâ€™s Quantum Collections.
The opposite category of commutative von Neumann algebras admits a noncartesian closed monoidal structure, where the monoidal product corresponds to the spatial product of measurable spaces.
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