Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options answers only not deleted user 102343

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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 ( …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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" $\mathbb 1\to X$). …
Maxime Ramzi's user avatar
  • 15.9k
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 $R$, …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k
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 …
Maxime Ramzi's user avatar
  • 15.9k

15 30 50 per page