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Part of higher category theory that for instance in Algebraic Topology enables us to capture finer homotopic distinctions. As in say Eilenberg-Maclane spaces.
5
votes
Accepted
Compact generation of the infinity category of stable infinity categories
Proposition 4.20 in the same paper shows that the localization is in fact $\omega$-accessible, i.e. the fully faithful right adjoint in question preserves filtered colimits. This implies that the loca …
3
votes
Accepted
How to define the $\infty$-category of left fibrations?
First let me point out a small typo : it should be functors over $\mathcal C$ which send cocartesian edges to cocartesian edges (this doesn't matter for left fibrations, but for cocartesian fibrations …
1
vote
Accepted
Morphisms in category of left fibrations
The answer is yes, but $\mathrm{LFib}(\mathcal C)$ is also the full subcategory of $(\mathrm{Cat}_\infty)_{/\mathcal C}$, it just so happens that you can prove that any morphism between such is a left …
3
votes
Pushforward of cocartesian fibrations
Let me try to expand on what I wrote in the comments. I'll focus on left Kan extensions- I think the story for right Kan extensions is a bit more subtle, for reasons I'll ty to mention at the end.
A ( …
5
votes
Comparing the Stacks Project Homotopy limit with limits in the $\infty$-category
There is a reference for this in Lurie's Higher topos theory - specifically, see Theorem 4.2.4.1, Corollary 4.2.4.8.
The key to these is Proposition 4.2.4.4, which itself relies heavily on Appendix A …
6
votes
Left Kan extension and finite product preserving
Yes, but this is a completely general phenomenon unrelated to animated rings and sheaves. The general (surprising!) phenomenon is that the left Kan extension of any product preserving functor $C\to An …
5
votes
Criterion for the Lurie tensor product of $\infty$-categories to commute with infinite products
First, a clarification about the question : as Marius points out in the comments, it sort of depends on what you mean by Lurie tensor product. If you mean the one at the level of presentable categorie …
10
votes
Compact category which is not idempotent complete
$Idem$ is in fact compact - it is a retract of the following finite category $C$: it has a single object $x$, and is free on an the endomorphism $e$ of $x$, the homotopy $h:e^2\simeq e$ and the higher …
4
votes
Accepted
TR2 for homotopy category of stable $\infty$-category
"This is equivalent to the assertion that the construction of the large diagram computes the suspension functor $\Sigma$"
My previous answer was based on me misreading this quote :)
You want to show t …
4
votes
Accepted
Density Theorem for $\infty$-Categories (HTT, Lemma 5.1.5.3)
I'm going to deal with the case of $\mathcal E^1\subset \mathcal E^0$. Note that by composition of pullbacks, $\mathcal E^0 = \mathcal C_{/X}\times_{\mathcal P(S)}\mathcal P(S)_{j(s)/}$, while $\math …
5
votes
Accepted
Does the forgetful functor from an over-$(\infty,1)$-category create weakly contractible lim...
You can also use Quillen's theorem A : to prove that $C \to D$ is initial, it suffices to show that for every $d\in D$, $C \times_D D_{/d}$ is weakly contractible.
In the case where $C\to D$ is fully …
8
votes
Accepted
$\text{Mod}(A)$ is an $E_n$ category $\Leftrightarrow$ $A$ is an ??? algebra
$E_0$ is not quite "no extra structure" : you know who $A$ is inside $Mod(A)$, so it's a pointed category (more generally, an $E_0$ object in $\mathcal S$ is an object with a "unit" $\mathbb 1\to X$). …
2
votes
Accepted
Is the symmetric monoidal product on the $\infty$-category of $R$-modules unique?
If by "$R$ is the unit object" you mean : 1- the object $R$ in $Mod_R$ is the unit and 2- The induced commutative algebra structure on $R = map(1,1)$ is the given commutative algebra structure on $R$, …
3
votes
Accepted
Reference request: the free adjunction being free as an $(\infty, 2)$-category?
One has to unravel the language a little bit, but in Riehl-Verity you are looking for:
Theorem 4.3.9, Theorem 4.3.11, Propositions 4.4.7, 4.4.11, 4.4.17, Theorem 4.4.18.
All of them are special cases …
5
votes
Accepted
Adjunctions and inverse limits of derived categories
A reference for exactly this type of problem in general is a paper by Horev and Yanovski called "On conjugates and adjoint descent".
Given a diagram $C \to D_i$ of left adjoints $f_i$ with right adjoi …