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First to answer and accepted with score of 10 or more. This badge can be awarded multiple times.

Awarded 11893 times.

Question concerning the coefficients of block idempotents

Awarded 16 hours ago

Geoff Robinson

43.6k5 gold badges117 silver badges164 bronze badges

Pasch axiom and Pythagorean field condition?

Awarded yesterday

Mauro ALLEGRANZA

1,6811 gold badge13 silver badges17 bronze badges

Lower bounds on (truncated) Fourier transform of functions of constant modulus and bounded derivative

Awarded 2 days ago

Johan Andersson

2,90322 silver badges29 bronze badges

Object of proven finiteness, yet with no algorithm discovered?

Awarded Jul 17 at 23:40

Joe Silverman

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Closed form for $\sum_{n=0}^\infty \frac1{2^{2^n}}$?

Awarded Jul 16 at 21:35

Carlo Beenakker

183k17 gold badges440 silver badges636 bronze badges

Could efficient solutions of $x^2+n y^2=A$ be related to integer factorization?

Awarded Jul 16 at 0:36

Aurel

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Is there a known elliptic curve, $E/\Bbb{Q}$, such that the rank of $E_D/\Bbb{Q}$ is bounded by some constant $M$, for all integers $D \in \Bbb{Z}$?

Awarded Jul 16 at 0:36

Stanley Yao Xiao

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Can an integral equation always be rewritten as a differential equation?

Awarded Jul 15 at 19:37

mathphysicist

5,2531 gold badge41 silver badges44 bronze badges

Are any embeddings $[0,1]\to\mathbb{R}^3$ topologically equivalent?

Awarded Jul 14 at 23:52

Shijie Gu

2,0631 gold badge14 silver badges18 bronze badges

Solve $\binom{n}{k}=m$ for $(n,k)$

Awarded Jul 14 at 13:25

Daniel Weber

3,0641 gold badge11 silver badges25 bronze badges

Product structure in Milnor exact sequence

Awarded Jul 14 at 6:41

Nicholas Kuhn

10.9k31 silver badges56 bronze badges

Is there a theorem which provides conditions under which a power series satisfies the reciprocal root sum law?

Awarded Jul 11 at 5:05

Alexandre Eremenko

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Is there a prime number $p$ such that $p$ divides the class number of $\mathbb{Q}(\sqrt{-p})$?

Awarded Jul 11 at 2:33

GH from MO

102k8 gold badges279 silver badges381 bronze badges

Can local $0^\#$ exists in L?

Awarded Jul 10 at 22:40

Asaf Karagila♦

38.5k8 gold badges129 silver badges275 bronze badges

Irreducible representation of the product of two groups and tensor product

Awarded Jul 10 at 1:25

Venkataramana

11.2k1 gold badge43 silver badges66 bronze badges

Citation hunting: Floer on spectral sequences

Awarded Jul 9 at 10:35

Dmitrii Korshunov

2,37416 silver badges24 bronze badges

Low dimensional homotopy groups of $\operatorname{Top}(4)$

Awarded Jul 9 at 10:35

skupers

8,0982 gold badges41 silver badges79 bronze badges

Does GCH for alephs imply the axiom of choice?

Awarded Jul 9 at 1:26

Asaf Karagila♦

38.5k8 gold badges129 silver badges275 bronze badges

A recurrence satisfied by a function asymptotic to $n^n$

Awarded Jul 9 at 1:26

Fedor Petrov

104k9 gold badges253 silver badges433 bronze badges

What is the formula for $\mathcal P_{n}^{k} (a_{1}, a_{2}, ...)$, defined by Peter Luschny?

Awarded Jul 8 at 23:49

Peter Taylor

6,9761 gold badge21 silver badges29 bronze badges

Does closedness of the image of unit sphere imply the closed range of the operator

Awarded Jul 8 at 17:15

Jochen Glueck

11.8k2 gold badges38 silver badges57 bronze badges

Coincidence between coefficients of tanh(tan(x/2)) and Chow ring computations?

Awarded Jul 8 at 14:16

Samir Canning

7761 gold badge5 silver badges13 bronze badges

Can we have this sequence where choice fails and returns?

Awarded Jul 8 at 7:23

Asaf Karagila♦

38.5k8 gold badges129 silver badges275 bronze badges

Why does the 2-category of groups have (some, strict) coinserters but not (strict) inserters?

Awarded Jul 6 at 19:40

Martti Karvonen

6315 silver badges10 bronze badges

Criterion for being reflexive via Ext

Awarded Jul 6 at 16:17

Jason Starr

4,1011 gold badge92 silver badges111 bronze badges

Which part(s) of this proof of Goodstein's Theorem are not expressible in Peano arithmetic?

Awarded Jul 6 at 12:55

Joel David Hamkins

230k44 gold badges754 silver badges1.3k bronze badges

Analyticity of $f*g$ with $f$ and $g$ smooth on $\mathbb{R}$ and analytic on $\mathbb{R}^*$

Awarded Jul 5 at 7:18

Bazin

15.7k32 silver badges63 bronze badges

intersection of ideals in a commutative ring vs their product

Awarded Jul 4 at 23:07

J.C. Ottem

11.6k2 gold badges42 silver badges77 bronze badges

Sets of algebraic integers whose differences are units

Awarded Jul 4 at 7:37

Henri Cohen

12.6k1 gold badge32 silver badges59 bronze badges

Functions whose product with every $L^1$ function is $L^1$

Awarded Jul 4 at 1:37

Jarosław Błasiok

1,1205 silver badges11 bronze badges

Rigid non-archimedean real closed fields

Awarded Jul 3 at 14:18

Dave Marker

3,46022 silver badges22 bronze badges

Proof of "Possible new series for $\pi$" without use of physics

Awarded Jul 2 at 18:47

Hjalmar Rosengren

2,16816 silver badges20 bronze badges

Detecting a PL sphere and decompositions

Awarded Jul 2 at 2:20

Sam Nead

27k5 gold badges68 silver badges127 bronze badges

Formal geometry

Awarded Jul 2 at 2:20

S. Carnahan♦

45.3k6 gold badges113 silver badges219 bronze badges

When do two ultrafilters yield isomorphic ultrapowers?

Awarded Jul 1 at 23:10

Gabe Goldberg

7,96937 silver badges45 bronze badges

When is an algebra defined by generators and relations finite-dimensional and satisfies Poincaré duality?

Awarded Jul 1 at 15:15

Zach Teitler

6,2273 gold badges33 silver badges63 bronze badges

Duplicating Matryoshka dolls

Awarded Jul 1 at 15:15

Martin Hairer

9,8233 gold badges42 silver badges53 bronze badges

Is there an infinite subset of $\Bbb{R}$ not homeomorphic to any of its proper subsets?

Awarded Jun 30 at 18:52

Will Brian

17.8k3 gold badges78 silver badges102 bronze badges

Representing $\Gamma(a-x)$ in terms of $\Gamma(kx)$ and $\Gamma(a)$ and elementary functions

Awarded Jun 30 at 14:34

Terry Tao

112k32 gold badges450 silver badges532 bronze badges

$\log |f|$ is subharmonic

Awarded Jun 29 at 14:56

Carlo Beenakker

183k17 gold badges440 silver badges636 bronze badges

About Friedrichs historical contribution to QFT cited in Reed and Simon

Awarded Jun 29 at 14:56

Carlo Beenakker

183k17 gold badges440 silver badges636 bronze badges

How hard is it to compute the Davenport constant?

Awarded Jun 29 at 14:56

Carlo Beenakker

183k17 gold badges440 silver badges636 bronze badges

Possible new series for $\pi$

Awarded Jun 28 at 16:48

Jesús Guillera

1,20914 silver badges17 bronze badges

First known proof of $\sqrt 2$ is irrational with prime factorization?

Awarded Jun 28 at 9:08

Carlo Beenakker

183k17 gold badges440 silver badges636 bronze badges

Is there a non-perfect field in which polynomials of large degree are reducible?

Awarded Jun 28 at 7:27

Will Sawin

141k9 gold badges308 silver badges539 bronze badges

Computation of a minimal polynomial

Awarded Jun 28 at 7:27

Igor Rivin

95.9k11 gold badges151 silver badges361 bronze badges

embeddings of product of spheres in Euclidean spaces

Awarded Jun 28 at 7:27

Igor Rivin

95.9k11 gold badges151 silver badges361 bronze badges

Is it consistent with ZFC that the real line is approachable by sets with no accumulation points?

Awarded Jun 27 at 21:20

Joel David Hamkins

230k44 gold badges754 silver badges1.3k bronze badges

What gets to be called a "proper class?"

Awarded Jun 27 at 13:10

Joel David Hamkins

230k44 gold badges754 silver badges1.3k bronze badges

Does $\int_{\mathbb R^d} (1+|x|^{1 + \alpha}) \ell (x) \, d x < \infty$ imply $\int_{\mathbb R^d} (1+|x|) |\ell (x)|^{1-\alpha} \, d x < \infty$?

Awarded Jun 27 at 6:17

Terry Tao

112k32 gold badges450 silver badges532 bronze badges

Properties that only Lorentzian manifolds have

Awarded Jun 26 at 7:17

Nicolast

1,9085 silver badges10 bronze badges

A polynomial with at least a simple root

Awarded Jun 26 at 1:43

Will Sawin

141k9 gold badges308 silver badges539 bronze badges

When is a linear isomorphism of $M_n(\mathbb{C})$ given by unitary conjugation?

Awarded Jun 25 at 12:27

LSpice

12k4 gold badges42 silver badges66 bronze badges

Why can't proofs have infinitely many steps?

Awarded Jun 24 at 18:25

Richard Borcherds

20.6k8 gold badges96 silver badges112 bronze badges

Are there ill-founded "maximally wide" models of $\mathsf{ZFC}$?

Awarded Jun 24 at 14:57

Ali Enayat

17.3k2 gold badges62 silver badges103 bronze badges

Geodesic completeness and complete Killing fields

Awarded Jun 24 at 14:57

Anton Petrunin

44.4k14 gold badges132 silver badges296 bronze badges

notation for formal Laurent series

Awarded Jun 23 at 5:16

Pete L. Clark

65.1k12 gold badges237 silver badges380 bronze badges

Golomb subsets of $\mathbb{N}$

Awarded Jun 23 at 1:31

YCor

62.3k5 gold badges182 silver badges281 bronze badges

Infinite dimensional finitely generated algebraic division algebra

Awarded Jun 21 at 11:16

Jeremy Rickard

34.4k2 gold badges107 silver badges147 bronze badges

What is the name of this relative semidirect product of groups?

Awarded Jun 21 at 7:16

Myself

6066 silver badges7 bronze badges

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