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Is there a regular pentagon with a rational point on each edge?

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Peter Mueller

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Why are finitely generated modules over principal artin local rings direct sums of cyclic modules?

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Luc Guyot

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Uniform distribution on a simplex

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Iosif Pinelis

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Isotopy in 3-manifolds

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Ian Agol

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Is there a physical reason that fields in QFT are globally defined?

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Igor Khavkine

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Maximal set of $n$-bit strings that does not span $\mathbb{R}^n$

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Fedor Petrov

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Representation of μ-recursive functions

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Joel David Hamkins

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Is the Tukey order well-founded

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Gabe Goldberg

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What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

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Jesse Elliott

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Examples of ZBMath reviews that motivated you to read the paper

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Timothy Chow

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Which journals publish expository work?

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mathphysicist

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Mathematical journals that accept long papers (up to 100 pages)

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Gerald Edgar

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What is the minimal density of a set A such that A+A = N?

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Jukka Kohonen

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What is the minimal density of a set A such that A+A = N?

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Emil Jeřábek

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Gödel's ontological proof & Benzmüller's work

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Timothy Chow

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Recognizing free groups

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Carl-Fredrik Nyberg Brodda

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Analytic continuation of holomorphic functions

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Zen Harper

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Euler's proof of $\frac{\pi}{6}=1-\frac{1}{2}-\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}-\cdots$

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GH from MO

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Initiation to constructive mathematics

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Noah Schweber

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Grothendieck's Galois Theory today

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David Roberts♦

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What are some toy models for the stable homotopy groups of spheres?

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Tyler Lawson

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Mathematics of path integral: state of the art

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Kevin H. Lin

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Has there been any progress on Conway's and Soifer's shortest paper?

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David E Speyer

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What are some toy models for the stable homotopy groups of spheres?

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Dave Benson

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Jensen-like inequality for random matrix: $\Bbb E[\det X^2]\ge\det\Bbb E[X^2]$

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TheSimpliFire

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Is the Gelfand-Graev character isomorphic to a cohomology group for some sheaf on a Deligne-Lusztig variety?

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Jim Humphreys

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Motivational ideas for the Gelfand-Graev character of a finite group of Lie type

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Jim Humphreys

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Homotopy groups of fiber products

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skd

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How can I evaluate the following sum?

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Alexandre Eremenko

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Is this a typo in Macdonald's paper "The Poincaré Series of a Coxeter Group"?

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Grant B.

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Why is Lie's Third Theorem difficult?

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David E Speyer

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Nimber multiplication

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Alex Fink

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Con(PA) via non-well-foundedness?

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Joel David Hamkins

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When are configuration spaces aspherical?

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Qiaochu Yuan

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Examples of interesting false proofs

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Fedor Petrov

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Reference request: Grothendieck´s period conjecture?

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abx

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Non-simple groups $G$ with only non-trivial quotient isomorphic to $G$

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Keith Kearnes

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In search of an alternative proof of a series expansion for $\log 2$

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Richard Stanley

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Interesting results for open Riemann surfaces

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Henri

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Is GCH useful in proving theorems?

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Dave Benson

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Conjecture: Given any five points, we can always draw a pair of non-intersecting circles whose diameter endpoints are four of those points

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Iosif Pinelis

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Examples of interesting false proofs

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Feldmann Denis

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Varieties where every algebra is free

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John Baldwin

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Etale spaces using Kan extensions

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David Carchedi

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Studying higher categories from the bottom up

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Mike Shulman

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What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

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bof

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Non-simple groups $G$ with only non-trivial quotient isomorphic to $G$

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YCor

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What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

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Todd Eisworth

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Failures that lead eventually to new mathematics

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Slobodan Simić

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When has the scaffolding been more important than the completed building?

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Mikhail Katz

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What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

Awarded Nov 28 at 10:18

Jesse Elliott

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When has the scaffolding been more important than the completed building?

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rimu

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What is the inverse image sheaf necessary for in algebraic geometry?

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S. Carnahan♦

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Hausdorff and Naive Set Theory

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John Stillwell

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Groups acting on infinite dimensional CAT(0) cube complex

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AGenevois

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Is $S_\omega/F_\omega$ embeddable to $S_\omega$?

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YCor

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Is $1 = \sum_{n=1}^{\infty} \frac{\pi(p_n^2)-n+2}{p_n^3-p_n}$ , where $\pi$ denotes the prime counting function and $p_n$ denotes the $n$-th prime?

Awarded Nov 27 at 8:30

GH from MO

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How to show that $\log 2(1/2\log 2\log 4 + 1/3\log 3\log 6 + \dotsb) + 1/2\log 2 - 1/3\log 3 + 1/4\log 4 - \dotsb = 1/\log 2$

Awarded Nov 27 at 6:37

GH from MO

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Applications of infinite Ramsey's Theorem (on N)?

Awarded Nov 27 at 3:08

T.Karageorgos

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What is the most "concrete-feeling" equivalent formulation of the Continuum Hypothesis that you can think of?

Awarded Nov 26 at 11:26

Alessandro Codenotti

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