Notable Question - Badge - Mathematics Stack Exchange

Notable Question

Question with 2,500 views. This badge can be awarded multiple times.

Awarded 104440 times.

What makes an interval compact or non-compact?

Awarded Nov 19 at 19:32

PythonSage

1,07210 silver badges24 bronze badges

Bounded random walk

Awarded Nov 19 at 19:13

Aleksejs Fomins

2,34015 silver badges23 bronze badges

QR decomposition using Householder reflections: how to calculate Q?

Awarded Nov 19 at 18:07

Thu07

131 silver badge4 bronze badges

Pool Table Word Problem

Awarded Nov 19 at 16:21

BlehBlorg

131 silver badge6 bronze badges

Convergence in distrubution sense and convergence of distribution to a distrubution.

Awarded Nov 19 at 15:34

Pierre

4373 silver badges14 bronze badges

Finding number of homomorphisms from $\mathbb{Z} \to S_3$ [duplicate]

Awarded Nov 19 at 14:26

ash

4,1582 gold badges28 silver badges46 bronze badges

Is there a "simple" way of proving Stirlings formula? [duplicate]

Awarded Nov 19 at 12:34

David

88215 silver badges35 bronze badges

Basis for $l^{\infty}$

Awarded Nov 19 at 9:52

89085731

7,9825 gold badges38 silver badges83 bronze badges

Plotting the Phase Portrait of a System of Nonlinear ODEs in Matlab 2017a

Awarded Nov 19 at 6:30

Matthew Graham

5676 silver badges21 bronze badges

Closed kernel implies continuous linear functional : Zorn's Lemma

Awarded Nov 19 at 5:28

Manan

1,62612 silver badges18 bronze badges

Let $G$ be a cyclic (or not) group of order $n$ and let $k$ be an integer relatively prime to $n$. Prove that the map $x \mapsto x^k$ is surjective.

Awarded Nov 19 at 5:01

Username Unknown

4,8439 gold badges62 silver badges113 bronze badges

How many ways can you build a football/soccer team?

Awarded Nov 19 at 1:26

Julio Kaegi

311 silver badge3 bronze badges

Nonlinear Least Squares Fit to Custom Function in C#

Awarded Nov 18 at 22:48

benavidezb

111 silver badge2 bronze badges

How to contract a 4th rank Levi Civita tensor?

Awarded Nov 18 at 21:20

Satyam Panchal

311 silver badge4 bronze badges

When are three points of a projective plane collinear?

Awarded Nov 18 at 18:47

Averroes2

1,1657 silver badges16 bronze badges

Lambda Calculus, applicative vs normal order

Awarded Nov 18 at 18:11

Pengibaby

2192 silver badges9 bronze badges

Why can't a 4-regular graph be both planar AND bipartite.

Awarded Nov 18 at 17:18

Tito

591 gold badge3 silver badges7 bronze badges

Some questions on the Hardy Littlewood Maximal Function

Awarded Nov 18 at 16:25

yoshi

3,6592 gold badges28 silver badges54 bronze badges

How could we formalize the introduction of new notation?

Awarded Nov 18 at 13:53

Adam

7144 silver badges11 bronze badges

Finding closed form for $\sum_{k=1}^n k2^{k-1}$

Awarded Nov 18 at 11:00

Diego Marques

911 silver badge5 bronze badges

Double integrals - when do I need to split the area of integration?

Awarded Nov 18 at 10:11

john doe

9135 silver badges11 bronze badges

What is the expected value of this game for large N?

Awarded Nov 18 at 9:26

confucious

3502 silver badges12 bronze badges

Logical snail along a straight line

Awarded Nov 18 at 8:54

saket kumar

1331 silver badge11 bronze badges

How to find the coordinates of a point in a triangle if the other 2 points coordinates and length between them are known?

Awarded Nov 18 at 8:15

Koos

31 silver badge3 bronze badges

Absolute Value of Riemann Integrable Function

Awarded Nov 18 at 8:15

Eric

111 silver badge4 bronze badges

Conformal map of the unit disk onto itself which is not 1 to 1

Awarded Nov 18 at 8:15

Alexisz

5013 silver badges9 bronze badges

A particle moving in a straight line has an acceleration given by $a(t)=2t$. The initial velocity of the particle is $ 2 $ cm/sec.

Awarded Nov 18 at 6:45

Cetshwayo

3,15614 gold badges58 silver badges96 bronze badges

Can sets of cardinality $\aleph_1$ have nonzero measure?

Awarded Nov 18 at 2:41

Keshav Srinivasan

11k3 gold badges33 silver badges102 bronze badges

If $f(x)=0 \implies f'(x)>0$, is the zero set of $f$ a single point?

Awarded Nov 17 at 23:50

Lonidard

4,3431 gold badge20 silver badges30 bronze badges

Minimum (Expected) distance between two points in a Poisson Point Process

Awarded Nov 17 at 22:46

SJa

8496 silver badges19 bronze badges

The Modulus of all the roots of a Polynomial are equal to $1$

Awarded Nov 17 at 21:41

math110

95.2k17 gold badges155 silver badges528 bronze badges

Divergence of Vector Field: Maximizing, Normalizing, Singularities, Interpretation

Awarded Nov 17 at 20:19

electronpusher

9981 gold badge9 silver badges17 bronze badges

Solve ODE using Fourier series.

Awarded Nov 17 at 18:57

Parseval

6,7691 gold badge29 silver badges66 bronze badges

Exercise 9, Chapter 2 of Stein's Fourier Analysis. Showing that a fourier series does not converge absolutely but converges conditionally.

Awarded Nov 17 at 15:23

nomadicmathematician

6,3697 gold badges53 silver badges143 bronze badges

Sufficient conditions for $L^2$ convergence implying almost everywhere convergence.

Awarded Nov 17 at 13:53

xel

5504 silver badges14 bronze badges

Restricted partition of integer: strictly k distinct parts from a set

Awarded Nov 17 at 11:53

Sunein

531 silver badge5 bronze badges

How many subgroups or order 8 an abelian Group of order 72 can have

Awarded Nov 17 at 11:26

Jam

2,84826 silver badges48 bronze badges

I roll three dice and keep only the largest two

Awarded Nov 17 at 10:50

Albuz

1211 silver badge4 bronze badges

Cool way of finding $\cos\left(\frac{\pi}{5}\right)$

Awarded Nov 17 at 8:24

Adam

7728 silver badges19 bronze badges

Show that a countable infimum of stopping times is a stopping time

Awarded Nov 17 at 8:01

MSE

3,2531 gold badge17 silver badges37 bronze badges

Number of itersection points between two monotonously decreasing functions

Awarded Nov 17 at 5:19

barak manos

43.7k8 gold badges60 silver badges137 bronze badges

Pauli Operator acting on Hadamard Basis doesn't behave as I would expect

Awarded Nov 17 at 2:46

eesweed

431 silver badge4 bronze badges

How much would you be willing to pay to play this card game?

Awarded Nov 17 at 0:27

Stephen Ge

2434 silver badges19 bronze badges

Prove that both the range and null space of E are invariant under T if and only it ET=TE.

Awarded Nov 16 at 23:35

Mitchell Faas

1,6681 gold badge15 silver badges31 bronze badges

Orbits under Conjugation Action

Awarded Nov 16 at 23:35

Renat Sergazinov

3321 gold badge3 silver badges19 bronze badges

Cutting a stick randomly into 3 pieces - What is the expected length of the shortest stick?

Awarded Nov 16 at 22:40

24n8

1,52117 silver badges31 bronze badges

Norm in $L^2$ space

Awarded Nov 16 at 21:38

Kristian

1,2673 gold badges21 silver badges37 bronze badges

Solve the Recurrence Relation $T(n) = 2T(n/2) +T(n/4) + n^2$.

Awarded Nov 16 at 21:26

CodingwithHieroglyphics

131 silver badge3 bronze badges

$1 +\sqrt{-n}$ is irreducible in $\mathbb{Z}[\sqrt{-n}]$

Awarded Nov 16 at 21:10

Xindaris

2,58923 silver badges44 bronze badges

Easy Proof On Why The Orthic Triangle has the smallest perimeter.

Awarded Nov 16 at 20:00

Teddy

1012 silver badges4 bronze badges

Approximation of $x\log(x/a)$ for $x$ near a

Awarded Nov 16 at 18:19

user143141

211 silver badge2 bronze badges

3 vectors making equal angles with each other in 3d space?

Awarded Nov 16 at 17:13

Ritik Garg

2171 gold badge3 silver badges7 bronze badges

Changing the point of a taylor series

Awarded Nov 16 at 16:34

yotamoo

2,8719 gold badges38 silver badges48 bronze badges

Why divergence of radius vector equals 3?

Awarded Nov 16 at 13:52

user3600124

2033 silver badges8 bronze badges

How to derive a general formula for this problem? (pairs of people seated around a table)

Awarded Nov 16 at 7:01

Quixotic

22.9k34 gold badges135 silver badges226 bronze badges

Proving a right triangle with an altitude have two similar triangles

Awarded Nov 16 at 4:06

Justin

1,2455 gold badges14 silver badges23 bronze badges

Proving the Leibniz integral rule in measure theory

Awarded Nov 16 at 1:35

Žan Grad

3573 silver badges12 bronze badges

Determining the number of bit strings of length n that contains no adjacent 0s

Awarded Nov 15 at 23:39

Avocado

711 gold badge3 silver badges10 bronze badges

Proof of Nagumo's Theorem of invariance

Awarded Nov 15 at 22:42

Kamal Khalil

531 silver badge7 bronze badges

What's the intution behind defining the cotangent sheaf as $\Delta^\ast(\mathscr{I}/\mathscr{I}^2)$?

Awarded Nov 15 at 22:42

Daniel McLaury

25.5k3 gold badges56 silver badges119 bronze badges

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