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13 votes
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Tensor product of sites

The category $H$ can be described as the category of $E$-valued sheaves on $D$, or $F$-valued sheaves on $C$. You get a site by taking the category $C \times D$ and taking the topology generated by th …
Simon Henry's user avatar
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13 votes
1 answer
462 views

Is there any references on the tensor product of presentable (1-)categories?

Is there any references on the tensor product of (locally) presentable categories ? All I know about this is Lurie's book that deals with the $\infty$-categorical version, and a few references that d …
Simon Henry's user avatar
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7 votes

Compact objects in slice categories of finitely presentable categories

This is true. It is for example easy to see that the full subcategory of objects of this form is closed under all finite colimits*, dense and that these objects are all finitely presentable. I unfortu …
Simon Henry's user avatar
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6 votes
0 answers
145 views

Can we make Pres *-autonomous?

The category $\mathbf{Sup}$ of sup-lattices (posets admitting all supremum and supremum preserving map between them) is a well known example of a $*$-autonomous category: The internal Hom is simply t …
Simon Henry's user avatar
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5 votes
Accepted

Can conservativity depend on the universe?

Probably not the best one can do, and what follows might be a bit 'overkill', but it answer the question about dependency on universe, and it is a nice argument. Also if you know how the proof of th …
Simon Henry's user avatar
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1 vote

Bousfield localization of a left proper accessible model category

In combinatorial and accessible weak model categories (also on ArXiv) I've studied Bousfield localization of weak and semi-model categories in both the combinatorial and accessible case. In particular …
Simon Henry's user avatar
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