## Recent Questions

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### How can I randomly draw an ensemble of unit vectors that sum to zero?

33m ago Dustin G. Mixon 67718
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### Differential form on a compact manifold whose exterior derivative is nowhere zero?

47m ago marcelo827 1
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1h ago edpc 1
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### Is a Cauchy principal value invariant under a “change of variables”?

1h ago Jim Beech 11
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### Gradient estimates for subsolutions of elliptic equations

42m ago unknown (google) 1
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### How to combine correlated signals !?

1h ago Omid1989 1
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77
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### Homological characterization of smooth maps

2h ago Angelo 19.4k34775
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99
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### Vector field pull back from embedding

13m ago John Klein 7,1191928
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33
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### Characterizing a certain subset of isotropic vectors

2h ago Henrik Wilming 11
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54
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### Volume growth of covers and growth of deck-transformation groups

3h ago Yves Cornulier 2,9161611
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40
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### Reference request: construction of Steenrod operations for an odd p

1h ago Serge Lvovski 1,02219
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49
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### Is there an “accepted” jamming limit for hard spheres placed in the unit cube by random sequential adsorption?

55m ago Yoav Kallus 1,431714
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47
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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 ?

7h ago Joel David Hamkins 74.9k7187343
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77
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### Well-Ordering theorem of cardinal$\kappa$

8h ago Asaf Karagila 7,07311444
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2h ago Deb 1
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174
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### Why are affine Lie algebras called affine?

1h ago Jim Humphreys 25.9k3782
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5h ago Martin 1
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89
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### Why do rigid spaces have “not enough points”?

9h ago armpit6 81
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43
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### The sufficient condition of the Neumann problem

7h ago Andreas Minne 262
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152
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### Is this combination of generalized polygamma and dilogarithm actually zero? $\Im\;\psi^{(-2)}(1+i)+\frac1{4\pi}\text{Li}_2(e^{-2\pi})-\log\sqrt{2\pi}+\frac{5\pi}{24}+\frac12$

6h ago joro 4,23011031
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8h ago Heitor 33
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10h ago Sha 1
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### Free resolution for Lie algebras (reference)

9h ago Dietrich Burde 1,745312
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13
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2k
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### Is there any proof that you feel you do not “understand”?

1d ago Terry Tao 27.6k4107178
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1
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91
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3
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1
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101
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### Lipschitz map of the ellipse

14h ago Dustin G. Mixon 67718
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52
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### Are the d quantities log(\lambda_j.s+\mu_j) linearly independent over Q for all s>1?

3h ago Sylvain JULIEN 663310
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2
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197
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### Importance of separability vs. second-countability

10h ago Andrej Bauer 12.4k2668
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6
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438
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### Sequences equidistributed modulo 1

8h ago Aaron Meyerowitz 11.5k11031
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139
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### What are the main structure theorems on finitely generated commutative monoids?

17h ago John Baez 1,770720
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1
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55
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### Is there any result concerning on the metric dimension of inverse limit?

12h ago BSteinhurst 819138
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64
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6m ago Rafa 622
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2
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123
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### A question about large real closed fields

21h ago The User 2838
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2
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118
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### On finite groups with same complex-valued character table

22h ago Dietrich Burde 1,745312
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1
answer
90
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### Is this cube packing possible?

21h ago Ricky Demer 6,361831
4
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1
answer
346
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### Doubt in the proof of Stickelberger’s Theorem

19h ago Dietrich Burde 1,745312
1
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1
answer
91
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### Composition in the category quotient

4h ago Marcelo Silva 13
5
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1
answer
153
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### What is an interpretation of the relation in the cohomology of the pure braid groups?

21h ago Ryan Budney 21.6k140101
2
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1
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141
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### Reference request: Minimal Axiomatizations of PA over (+,x,<=).

7h ago abo 689126
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28
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14h ago Levius 1
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177
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### The relations between the Perelman’s entropy functional and notions of entropy from statistical mechanics

17h ago Robert Haslhofer 37126
3
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1
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245
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### Differentiable manifolds by Serge Lang question

22h ago Andreas Blass 32.9k454109
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89
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### von Staudt-Clausen for other special values

19h ago Filippo Alberto Edoardo 1,672512
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89
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### Proving a variety is not unirational

22h ago unit3000-21 311
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19h ago Rob 211
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2h ago d12 13
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### How to determine the number of a cube within a bigger cube?

1d ago Dustin G. Mixon 67718
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54
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### Zeroes of a homogeneous function

21h ago Stanley Yao Xiao 2,8461416