# Start a new discussion

## Not signed in

Want to take part in these discussions? Sign in if you have an account, or apply for one below

## Site Tag Cloud

Vanilla 1.1.10 is a product of Lussumo. More Information: Documentation, Community Support.

• CommentRowNumber1.
• CommentAuthorDavid_Corfield
• CommentTimeAug 25th 2021

Mentioned Pos.

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeAug 25th 2021
• (edited Aug 25th 2021)

then best to have a list including also the less exotic examples. Have now started one here.

Also adjusted your line to include pointer to (0,1)-category, in order to bring out the pattern.

And I adjusted the (old) paragraph now right before this list of examples, for generality and hyperlinking.

• CommentRowNumber3.
• CommentAuthorDavid_Corfield
• CommentTimeAug 25th 2021

Can we guess what makes a $(1,2)$-topos differ from an ordinary topos from the case of Pos? It contains an object which does what $\bottom \to \top$ does in Pos, i.e., classifying something?

• CommentRowNumber4.
• CommentAuthorMike Shulman
• CommentTimeAug 25th 2021

Classifying sieves = monic fibrations.

• Please log in or leave your comment as a "guest post". If commenting as a "guest", please include your name in the message as a courtesy. Note: only certain categories allow guest posts.
• To produce a hyperlink to an nLab entry, simply put double square brackets around its name, e.g. [[category]]. To use (La)TeX mathematics in your post, make sure Markdown+Itex is selected below and put your mathematics between dollar signs as usual. Only a subset of the usual TeX math commands are accepted: see here for a list.

• (Help)