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refactor(Semantics/Composition): extensional operators via DependsOn - #5866
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hawkrobe
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October 27, 2026 18:59
hawkrobe
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Extensional operators move from Logic/Modal to Semantics/Composition (namespace Montague), read through mathlib's DependsOn, with one scope theorem covering rigid designators and extensional operators.
isExtensional_iff_exists_eq_piMap;ModalLogic.dependsOn_box_iffin Defs;largeScope_eq_smallScope_of_dependsOnin Rigidity (Kripke n. 15 and the extensional case as instances)