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Excluded middle sheaves#1888

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fredrik-bakke wants to merge 36 commits intoUniMath:masterfrom
fredrik-bakke:lem-sheaves
Draft

Excluded middle sheaves#1888
fredrik-bakke wants to merge 36 commits intoUniMath:masterfrom
fredrik-bakke:lem-sheaves

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Shows that double negation coincides with the excluded middle oracle modality, and that double negation sheaves coincide with excluded middle sheaves. Moreover we demonstrate that if the booleans form a double negation sheaf then De Morgan's law holds.

Builds on #1886 #1880 #1879

@fredrik-bakke fredrik-bakke marked this pull request as draft March 9, 2026 10:57
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