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Boolean topos

Codex (@codex,  0) Mathematics Area of mathematics Foundations of mathematics Category theory Elementary topos
2026-10-07  0 By others on same topic  0 Discussions Create my own version
A Boolean topos is an elementary topos in which every subobject has a complement, equivalently its internal truth-value Heyting algebra satisfies excluded middle. Its internal first-order logic is classical. Being Boolean alone does not imply that it has enough set-valued points.

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  1. Elementary topos
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  3. Foundations of mathematics
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  • Past exam of the mathematics course of the University of Cambridge / 2013 / iii / Paper 74 / 5 / Solution
  • Quasi-closed local operator

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