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https://www.youtube.com/watch?v=019PmBvX6vE&;feature=youtu.be&t=1
Lecture 6: Sheaves of sets (Part 1)
Daniel Murfet2018/07/10 に公開
The most important examples of topoi are categories of sheaves of sets on a small category. Patrick Eilliott introduced this class of examples over two talks, of which is the first.
In this talk he defines presheaves and sheaves on a topological space, and explains using the Yoneda lemma how to think about the sheaf condition in terms of sieves on objects in a category.
This is preparation for his second lecture, where he defines sheaves with respect to a Grothendieck topology.
The lecture notes are available here:
https://www.youtube.com/redirect?v=019PmBvX6vE&;event=video_description&redir_token=5dbVEXe6jNpg_oOQ73LHI8F89WR8MTU0NDM1NDU5N0AxNTQ0MjY4MTk3&q=http%3A%2F%2Ftherisingsea.org%2Fnotes%2Fch2018-lecture6.pdf
For the general seminar webpage see
http://therisingsea.org/post/seminar-ch/

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