17
votes

### Why do Grothendieck topologies used in algebraic geometry typically involve finiteness conditions?

I guess a conceptual explanation is that algebraic geometry deals with localizations in order to glue global from local data, but the functor $M \mapsto M[f^{-1}]$ only preserves finite limits. In ...

- 57.6k

13
votes

### Why do Grothendieck topologies used in algebraic geometry typically involve finiteness conditions?

Finite presentation assumptions in algebraic geometry are usually there because of Noetherian approximation. Namely, if $f : X \to Y$ is a morphism of finite presentation and $Y = \operatorname{lim}_I ...

- 2,708

13
votes

### Math papers where the only issue is that someone else could've done it but didn't

Let me take the liberty of rephrasing the question slightly. Does the mathematical community put undue emphasis on accomplishing something "difficult," and thereby undervalue certain highly ...

Community wiki

8
votes

### Has incorrect notation ever led to a mistaken proof?

In module theory, there is a choice of which side the scalars acts on. Then, there is also the choice of which side the endomorphisms of the module act on.
Let $M$ be a right module, with scalars ...

Community wiki

3
votes

### Domains that may require a good categorical background

The blog by Bartosz Milewski comes to my mind. It focusses on the interplay between Haskell and category theory.

- 57.6k

3
votes

### Is there an alternative to the arXiv for uploading mathematical papers?

Aside the suggestion to send your preprint to a peer-review journal, here are some online repositories that I recently used together with (or as an alternative to) the arXiv (i.e., some of my ...

- 313

3
votes

### Has the mathematical content of Grothendieck's "Récoltes et Semailles" been used?

Yes, R&S proved to be influential in at least one sense, the mathematical work of Z. Mebkhout (part four is dedicated to him indeed: "À Zoghman Mebkhout l’ouvrier solitaire en témoignage de ...

- 793

3
votes

### Why do Grothendieck topologies used in algebraic geometry typically involve finiteness conditions?

To give an interesting data point, I can offer two examples of something that seems a bit more infinitary.
If we consider the category of finite-dimensional manifolds, and covers being submersions (or ...

- 31.8k

2
votes

### Domains that may require a good categorical background

Besides the CT-functional programming connection, in recent years a field of "applied category theory" (ACT) has emerged that seeks to apply category-theoretic ideas to fields beyond the ...

1
vote

Accepted

### Journals of applied mathematics with an economics bent?

https://www.resurchify.com/impact/category/Applied-Mathematics
Journal of Econometrics is a journal covering the categories related to Applied Mathematics (Q1); Economics and Econometrics (Q1); ...

- 26

1
vote

### Golden ratio in contemporary mathematics

Golden ratio appeared in the recent breakthrough of Frankl's Union Closed Set conjecture by Justin Gilmer, as well as the subsequent optimization of the lower bound constant. It relies crucially on ...

Community wiki

1
vote

### Good "casual" advanced math books

I'm surprised that no one has yet mentioned The Symmetries of Things by John Conway, Heidi Burgiel and Chaim Goodman-Strauss. It's ostensibly an introduction to symmetry groups but touches into ...

Community wiki

1
vote

### Has incorrect notation ever led to a mistaken proof?

I'm not entirely sure what the difference between wrong notation and wrong "underlying mathematics" is, so I'm going to present a few different examples, and hopefully this clarifies the ...

Community wiki

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