## Recent Questions

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### Modern Mathematical Achievements Accessible to Undergraduates

may 12 at 16:46 John Richard Samborski 11
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### Is there any proof that you feel you do not “understand”?

may 18 at 16:06 Terry Tao 27.8k4107178
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### objects which can’t be defined without making choices but which end up independent of the choice

1d ago Timothy Chow 14.5k168137
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### Why don’t more mathematicians improve Wikipedia articles?

1h ago Jérémy Blanc 1,5981313
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### Show that this ratio of factorials is always an integer

may 13 at 14:08 samuel lee 1
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### Philosophy behind Yitang Zhang’s work on the Twin Primes Conjecture

7h ago pageman 3993
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### Verifying the correctness of a Sudoku solution

may 7 at 16:21 Emil Jeřábek 10.6k12441
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### Proof of the weak Goldbach Conjecture

may 19 at 5:13 Rodrigo A. Pérez 1,652821
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### What is the effect of adding 1/2 to a continued fraction?

apr 29 at 2:43 Aaron Meyerowitz 11.5k11031
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### A Model where Dedekind Reals and Cauchy Reals are Different

apr 24 at 22:40 François G. Dorais 22.6k248113
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### What arithmetic information is contained in the algebraic K-theory of the integers

may 5 at 23:35 Rebecca Black 54123
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### Another colored balls puzzle (part II)

1d ago Douglas Zare 13.2k33658
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### Tangent space in Algebraic geometry and Differential geometry

may 2 at 1:52 roy smith 4,9513428
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### Vector fields on $(4n+1)$-spheres

may 1 at 1:19 Chris Gerig 5,52611240
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### Is there an algebraic curve over Q which is not modular?

may 11 at 23:51 François Brunault 7,38911335
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### Are the two meanings of “undecidable” related?

may 18 at 20:01 Thomas Benjamin 41917
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### Expected edit distance

may 5 at 16:47 fedja 19.4k24694
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### $n$-in-a-row game on $\mathbb{R}^2$

may 5 at 0:36 S. Carnahan 25.6k4190
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### Why is it hard to prove that the Euler Mascheroni constant is irrational?

may 4 at 20:04 Douglas Zare 13.2k33658
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### motivating geometric representation theory

may 4 at 14:01 Allen Knutson 12.4k12364
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### Concrete examples of noncongruence, arithmetic subgroups of SL(2,R)

may 9 at 18:02 BS 5,31311225
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### Does a *topological* manifold have an exhaustion by compact submanifolds with boundary?

may 2 at 8:31 Liviu Nicolaescu 11.3k12033
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### The role of the Automatic Groups in the history of Geometric Group Theory

may 13 at 16:14 Lee Mosher 5,8061926
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### Is deciding whether a Turing machine *provably* runs forever equivalent to the halting problem?

3h ago François G. Dorais 22.6k248113
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### Infinity-categories vs Kan complexes

may 1 at 11:05 Max 1115
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### History of the high-dimensional volume paradox

apr 27 at 7:05 Steven Landsburg 8,63412747
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### Another colored balls puzzle

may 14 at 8:58 Johan Wästlund 3,0681815
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### Visualize Fourth Homotopy Group of $S^2$

may 9 at 18:35 Daniele Zuddas 80829
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### Elliptic curves over QQ with identical 13-isogeny

may 17 at 3:21 Noam D. Elkies 18.1k46290
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### Can Inequivalent Topologies Have Same Sheaves/Cohomology?

may 9 at 22:57 Igor Minevich 736
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### Does an existence of large cardinals have implications in number theory or combinatorics?

may 3 at 22:23 Asaf Karagila 7,19811444
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### deRham cohomology of $S^n$ without Mayer-Vietoris

may 1 at 3:45 Bryan Clair 1786
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### If ZFC has a transitive model, does it have one of arbitrary size?

may 6 at 0:50 Andres Caicedo 14.4k14279
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### Sequences equidistributed modulo 1

may 19 at 8:59 Aaron Meyerowitz 11.5k11031
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### Counterintuitive consequences of the Axiom of Determinacy?

may 1 at 18:10 Andres Caicedo 14.4k14279
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### The classifying space of a gauge group

may 10 at 18:34 John Klein 7,2161928
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### When does an even-dimensional manifold fiber over an odd-dimensional manifold?

may 6 at 17:51 John Klein 7,2161928
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### How can I randomly draw an ensemble of unit vectors that sum to zero?

1d ago jc 3,925923
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### Relating two characterizations of ${\mathfrak sl}_{n > 2}$ among simple Lie algebras

may 18 at 14:38 Jim Humphreys 26k3782
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### Effect of abc conjecture on Fermat’s Last Theorem

may 17 at 20:11 quid 13.1k3151
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### What is the Q-construction, metaphysically?

apr 25 at 23:40 Steven Landsburg 8,63412747
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### Probability of random (0,1) Toeplitz matrix being invertible

apr 30 at 8:32 Per Alexandersson 1,761612
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### zeta(3) in terms of derivatives of zeta at 1/2 and pi

may 6 at 8:22 joro 4,26011031
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### Can nonstandard analysis be used to prove results in constructive or computable analysis?

apr 29 at 7:32 Sam Sanders 13614
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### probability calculation

may 11 at 19:53 Ori Gurel-Gurevich 4,2811817
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