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Great Question

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Awarded 651 times.

Reference book on measure theory

Awarded May 2 at 10:56

newbie

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Mathematical precise definition of a PDE being elliptic, parabolic or hyperbolic

Awarded May 2 at 10:56

shuhalo

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How can adding an infinite number of rationals yield an irrational number?

Awarded Apr 27 at 4:39

E.O.

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Cardinality of set of real continuous functions

Awarded Apr 3 at 9:24

kennytm

7,7235 gold badges39 silver badges37 bronze badges

Can we identify the duals of $\ell^\infty$ and $L^{\infty}$ with another "natural space"?

Awarded Mar 31 at 15:45

omar

2,6213 gold badges21 silver badges19 bronze badges

Why is a PDE a submanifold (and not just a subset)?

Awarded Mar 20 at 15:50

hase_olaf

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linear algebra over a division ring vs. over a field

Awarded Mar 17 at 11:17

Leo

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Geometric way to view the truncated braid groups?

Awarded Mar 12 at 11:16

Dan Rust

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$4494410$ and friends

Awarded Feb 20 at 19:40

Ross Millikan

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What is a simple example of an unprovable statement?

Awarded Feb 13 at 7:57

Michael Harris

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What is "ultrafinitism" and why do people believe it?

Awarded Jan 10 at 5:49

Noah Snyder

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What is $\gcd(0,0)$?

Awarded Dec 31, 2024 at 13:38

Konstantin Weitz

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Prove that the set of all algebraic numbers is countable

Awarded Dec 27, 2024 at 2:34

PandaMan

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Is there really no way to integrate $e^{-x^2}$?

Awarded Dec 4, 2024 at 6:45

Zolani13

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Prove $\left(\frac{2}{5}\right)^{\frac{2}{5}}<\ln{2}$

Awarded Nov 30, 2024 at 12:26

math110

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Can a limit of an integral be moved inside the integral?

Awarded Nov 18, 2024 at 7:50

Thomas Russell

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"Almost true": non-trivial claims that have exactly one counterexample

Awarded Nov 1, 2024 at 15:40

Dan

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Predicting Real Numbers

Awarded Oct 29, 2024 at 2:02

Jared

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What is a universal property?

Awarded Oct 14, 2024 at 5:29

Hans-Peter Stricker

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Zero probability and impossibility

Awarded Aug 23, 2024 at 5:10

Tim

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Why isn't reflexivity redundant in the definition of equivalence relation?

Awarded Aug 16, 2024 at 0:17

Chao Xu

5,9785 gold badges38 silver badges50 bronze badges

Is the notorious $n^2 + n + 41$ prime generator the last of its type?

Awarded Aug 15, 2024 at 18:48

MJD

67.4k43 gold badges307 silver badges613 bronze badges

What is $\sqrt{i}$?

Awarded Aug 14, 2024 at 10:42

Gordon Gustafson

3,4759 gold badges33 silver badges29 bronze badges

Is there a bijective map from $(0,1)$ to $\mathbb{R}$? [closed]

Awarded Aug 12, 2024 at 17:25

ieb

1,0572 gold badges8 silver badges3 bronze badges

Space of bounded continuous functions is complete

Awarded Aug 10, 2024 at 21:40

Rudy the Reindeer

48.1k29 gold badges173 silver badges350 bronze badges

Probability for an $n\times n$ matrix to have only real eigenvalues

Awarded Jul 27, 2024 at 5:02

Exodd

12.2k2 gold badges27 silver badges44 bronze badges

Different proofs of the Pythagorean theorem?

Awarded Jun 21, 2024 at 21:50

Shane

1112 gold badges3 silver badges7 bronze badges

Density of sum of two independent uniform random variables on $[0,1]$

Awarded May 31, 2024 at 12:17

Zhulu

1,2993 gold badges11 silver badges15 bronze badges

Intuitive meaning of Exact Sequence

Awarded May 29, 2024 at 21:31

finnlim

2,8232 gold badges20 silver badges27 bronze badges

Why is 'abuse of notation' tolerated?

Awarded May 22, 2024 at 15:48

Korgan Rivera

4,2289 gold badges46 silver badges62 bronze badges

Does mathematics become circular at the bottom? What is at the bottom of mathematics? [duplicate]

Awarded Apr 27, 2024 at 15:05

user119615

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What's the difference between stochastic and random?

Awarded Apr 21, 2024 at 15:22

Red Banana

24.8k21 gold badges100 silver badges205 bronze badges

What are Your Favourite Maths Puzzles?

Awarded Mar 27, 2024 at 23:31

Tom Boardman

3,6755 gold badges27 silver badges34 bronze badges

What's so special about standard deviation?

Awarded Mar 24, 2024 at 7:42

blue note

1,3552 gold badges10 silver badges17 bronze badges

Identity for convolution of central binomial coefficients: $\sum\limits_{k=0}^n \binom{2k}{k}\binom{2(n-k)}{n-k}=2^{2n}$

Awarded Mar 21, 2024 at 21:11

Skatche

1,5602 gold badges10 silver badges10 bronze badges

How to find a general sum formula for the series: 5+55+555+5555+.....?

Awarded Mar 21, 2024 at 14:07

akusaja

2,5617 gold badges29 silver badges38 bronze badges

What's the difference between $\mathbb{R}^2$ and the complex plane?

Awarded Mar 20, 2024 at 20:18

Cancan

2,8177 gold badges24 silver badges32 bronze badges

Can the golden ratio accurately be expressed in terms of $e$ and $\pi$

Awarded Mar 20, 2024 at 19:19

Nick

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Why do bell curves appear everywhere?

Awarded Mar 17, 2024 at 14:27

Shreyas Shridharan

1,1712 gold badges9 silver badges15 bronze badges

Why are gauge integrals not more popular?

Awarded Mar 10, 2024 at 10:28

Chris Brooks

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Probability density function vs. probability mass function

Awarded Mar 9, 2024 at 23:48

0x0

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Is the "determinant" that shows up accidental?

Awarded Mar 9, 2024 at 17:08

stats_model

1,1311 gold badge8 silver badges13 bronze badges

math fallacy problem: $-1= (-1)^3 = (-1)^{6/2} = \sqrt{(-1)^6}= 1$?

Awarded Mar 4, 2024 at 11:06

newcomer

9731 gold badge7 silver badges4 bronze badges

Is there any conjecture that has been proved to be solvable/provable but whose direct solution/proof is not yet known?

Awarded Feb 26, 2024 at 23:41

lone student

Explain "homotopy" to me [closed]

Awarded Feb 12, 2024 at 1:46

John Trail

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Continuous mapping on a compact metric space is uniformly continuous

Awarded Feb 5, 2024 at 8:12

the code

1,3512 gold badges10 silver badges10 bronze badges

What is the largest volume of a polyhedron whose skeleton has total length 1? Is it the regular triangular prism?

Awarded Jan 18, 2024 at 21:33

RavenclawPrefect

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Union of two vector subspaces not a subspace?

Awarded Jan 4, 2024 at 22:33

NSjonas

1,2272 gold badges10 silver badges9 bronze badges

In categorical terms, why is there no canonical isomorphism from a finite dimensional vector space to its dual?

Awarded Jan 3, 2024 at 18:12

Ben Blum-Smith

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What is the equation for a 3D line?

Awarded Dec 27, 2023 at 16:33

Ovi

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"Simple" beautiful math proof [closed]

Awarded Dec 17, 2023 at 6:10

user138276

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Relations between p norms

Awarded Nov 17, 2023 at 16:05

PianoEntropy

2,7565 gold badges21 silver badges32 bronze badges

Problems that become easier in a more general form

Awarded Nov 15, 2023 at 13:27

MGA

9,7784 gold badges43 silver badges59 bronze badges

Factorial, but with addition [duplicate]

Awarded Nov 9, 2023 at 16:01

akinuri

1,3934 gold badges10 silver badges17 bronze badges

Why can't you square both sides of an equation?

Awarded Oct 29, 2023 at 14:55

Jeff

3,4756 gold badges34 silver badges44 bronze badges

Simplicial Complex vs Delta Complex vs CW Complex

Awarded Oct 9, 2023 at 17:11

yoyostein

20.3k20 gold badges73 silver badges163 bronze badges

Why is $e^{\pi \sqrt{163}}$ almost an integer?

Awarded Oct 8, 2023 at 16:32

stevenvh

2,7745 gold badges22 silver badges25 bronze badges

Difference between "≈", "≃", and "≅"

Awarded Sep 25, 2023 at 2:26

GOTO 0

2,0122 gold badges19 silver badges24 bronze badges

Mathematicians' Tensors vs. Physicists' Tensors

Awarded Sep 24, 2023 at 13:56

msm

2,8562 gold badges13 silver badges24 bronze badges

Projection map being a closed map

Awarded Sep 5, 2023 at 19:50

M.Subramani

1,4712 gold badges13 silver badges13 bronze badges

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