## Recent Questions

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### Lawvere’s fixed point theorem and the Recursion Theorem

15m ago Peter LeFanu Lumsdaine 2,645819
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### Toric varieties over positive characteristic field

56m ago Nikita Kalinin 1,398417
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### affine schubert cells and bruhat order

59m ago prochet 3474
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### An integral with Gamma functions (Part 2)

1h ago S. Sra 10k11644
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### How do I find abelian subcategories of periodic triangulated categories?

1h ago Vivek Shende 3,071722
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### Question about the nullstellensatz for projective schemes

1h ago Daniel Barter 722412
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### Connected groupoids and action groupoids

2h ago Ronnie Brown 5,2091720
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### A duality on partial permutations

2h ago Stefan Kohl 2,600215
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### How many orders of infinity are there?

2h ago Yaoming Shi 1
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### Why is Set, and not Rel, so ubiquitous in mathematics?

2h ago Wlodzimierz Holsztynski 77247
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### Octonions and the Fano plane.

2h ago Drew Armstrong 51
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### Groupoid actions on spaces

3h ago Ronnie Brown 5,2091720
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### Set Theory exercise.

3h ago Asaf Karagila 7,11811444
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3h ago conex 1
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### Is a Cauchy principal value invariant under a “change of variables”?

4h ago Bazin 2,95828
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### Importance of separability vs. second-countability

4h ago Joseph Van Name 1,789411
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### decomposition of the injective hull of a torsion free module

4h ago Dietrich Burde 1,770312
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### exceptional divisor on a smooth surface

5h ago Sándor Kovács 23.7k25273
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### Under exactly what (extra) conditions (if any) is a connected Hausdorff manifold with a Riemannian metric a metric space?

5h ago Peter Michor 5,4221017
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5h ago Rafa 622
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### Vector field pull back from embedding

6h ago John Klein 7,1191928
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### Good uses of Siegel zeros?

6h ago Terry Tao 27.6k4107178
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### Geodesics on a Grassmannian

6h ago Peter Michor 5,4221017
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### How can I randomly draw an ensemble of unit vectors that sum to zero?

6h ago Dustin G. Mixon 72718
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### Differential form on a compact manifold whose exterior derivative is nowhere zero? [closed]

6h ago marcelo827 1
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### Is there an “accepted” jamming limit for hard spheres placed in the unit cube by random sequential adsorption?

6h ago Yoav Kallus 1,456714
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### Source of a formula for tensor product multiplicities?

7h ago Jim Humphreys 25.9k3782
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7h ago edpc 1
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### Reference request: construction of Steenrod operations for an odd p

7h ago Serge Lvovski 1,02219
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### Why are affine Lie algebras called affine?

7h ago Jim Humphreys 25.9k3782
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### How to combine correlated signals !?

7h ago Omid1989 1
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### Homological characterization of smooth maps

7h ago Angelo 19.4k34775
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### Characterizing a certain subset of isotropic vectors

8h ago Henrik Wilming 11
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8h ago Deb 1
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8h ago d12 23
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### Volume growth of covers and growth of deck-transformation groups

9h ago Yves Cornulier 2,9261611
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9h ago Sylvain JULIEN 663310
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### Composition in the category quotient

10h ago Marcelo Silva 13
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### What math institutes offer research in pairs/research in teams?

11h ago quid 12.9k3151
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11h ago Martin 1
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### Reference request: affine transforms + circle inversion?

11h ago Robert Bryant 21.8k37597
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### Is this combination of generalized polygamma and dilogarithm actually zero? $\Im\;\psi^{(-2)}(1+i)+\frac1{4\pi}\text{Li}_2(e^{-2\pi})-\log\sqrt{2\pi}+\frac{5\pi}{24}+\frac12$

12h ago joro 4,23011031
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### The sufficient condition of the Neumann problem

12h ago Andreas Minne 262
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### Is the equivalence between a $\Sigma^0_1$ and a $\Pi^0_1$ formula defining the same recursive set provable in a sufficiently strong arithmetic ?

13h ago Joel David Hamkins 74.9k7187343
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