Ultrasheaves and double negation
2004 (English)In: Notre Dame Journal of Formal Logic, ISSN 0029-4527, Vol. 45, no 4, 235-245 p.Article in journal (Refereed) Published
Moerdijk has introduced a topos of sheaves on a category of filters. Following his suggestion, we prove that its double negation subtopos is the topos of sheaves on the subcategory of ultrafilters—the ultrasheaves. We then use this result to establish a double negation translation of results between the topos of ultrasheaves and the topos on filters.
Place, publisher, year, edition, pages
2004. Vol. 45, no 4, 235-245 p.
Algebra and Logic
IdentifiersURN: urn:nbn:se:uu:diva-91029DOI: 10.1305/ndjfl/1099238447OAI: oai:DiVA.org:uu-91029DiVA: diva2:163603