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The lfc Grothendieck topology

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If you have a question about this talk, please contact Julia Goedecke .

A well known informal principle says that on a paracompact space, locally finite closed covers are just as good as open covers. In this talk, I will make this principle precise, and provide a systematic comparison of the two sites involved. This comparison will be seen to nicely illustrate various aspects of elementary topos theory (I mean, the elementary part of the theory of Grothendieck toposes).

This talk is part of the Category Theory Seminar series.

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Wellcome Trust Conference Centre, Genome Campus, Hinxton Zoom via link https://eng-cam.zoom.us/j/84914529444?pwd=Uml3OEM2c1BtbFhqaU1CcXN3akYwQT09, Meeting ID: 849 1452 9444 The Lightfoot Room, Divinity School, St John’s College, St John’s Street, Cambridge CB2 1TP and ZOOM

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