Notable Question - Badge - Mathematics Stack Exchange

Notable Question

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

Awarded 100917 times.

Proving the continuity of a function in its domain

Awarded 2 hours ago

sktsasus

2,0624 gold badges34 silver badges53 bronze badges

The identity morphism in $\mathbf{Set}$ is the identity function

Awarded 3 hours ago

Abel

1,8322 gold badges16 silver badges22 bronze badges

This function seems to defy the integral test, where am I going wrong?

Awarded 4 hours ago

Eli C

211 silver badge3 bronze badges

Probability 2 player card game with multiple patterns to win, who has the advantage?

Awarded 5 hours ago

David

1,7022 gold badges24 silver badges45 bronze badges

The chord length of an ellipse

Awarded 6 hours ago

John Majimboni

711 silver badge4 bronze badges

solving integral with complex analysis

Awarded 6 hours ago

Van

131 silver badge3 bronze badges

How many elements there exist in polynomial quotient ring $\mathbb{Z}_5[X]/(X^2+1)?$

Awarded 7 hours ago

mallea

8497 silver badges21 bronze badges

Probability of getting the flu

Awarded 8 hours ago

Angery Doge

1231 silver badge8 bronze badges

Exercise 2.7.1 of J. Norris, "Markov Chains"

Awarded 9 hours ago

Sasha

71.6k7 gold badges147 silver badges226 bronze badges

Prove that a quotient of an n-dimensional ball by an equivalence relation is homeomorphic to an n-dimensional sphere.

Awarded 10 hours ago

MathsMy

9118 silver badges19 bronze badges

Lie algebra of the cartesian product between Lie groups [duplicate]

Awarded 10 hours ago

Txordi

1651 silver badge7 bronze badges

Volume of tetrahedron given $6$ sides.

Awarded 11 hours ago

Ahmed S. Attaalla

19.2k8 gold badges48 silver badges77 bronze badges

How do you determine the complexity class of a problem like solving an integral?

Awarded 14 hours ago

EpsilonVector

1811 silver badge4 bronze badges

Does $\mathbb{N\times(N^N)}$ have the same cardinality as $\mathbb N$ or $\mathbb R$?

Awarded 15 hours ago

zu_m

1692 silver badges10 bronze badges

infinite series and proof of sum using induction.

Awarded 19 hours ago

Felicia

612 silver badges5 bronze badges

How is an empty Set an initial object

Awarded 19 hours ago

hgiesel

1,2878 silver badges17 bronze badges

A fair die is rolled five times. Find the probability that one shows twice, three shows twice, and six shows once.

Awarded 20 hours ago

adi_226

331 silver badge5 bronze badges

Proof about finite dimensional vector spaces over fields

Awarded 20 hours ago

terrible at math

1,6075 gold badges33 silver badges49 bronze badges

If G has a composition series so does H and G/H

Awarded yesterday

User112358

1,58715 silver badges31 bronze badges

Integrating $x \sin(nx)$

Awarded yesterday

Jakke

991 silver badge6 bronze badges

What is a pullback in simple calculus context?

Awarded yesterday

Your neighbor Todorovich

8,4808 gold badges55 silver badges106 bronze badges

Strictly quasiconvex functions: Any local minimum is a global minimum [closed]

Awarded yesterday

user3750030

1291 silver badge2 bronze badges

How to determine the general formula for a summation?

Awarded yesterday

James Smithson

311 silver badge4 bronze badges

Book for field and galois theory.

Awarded yesterday

Bhaskar Vashishth

11.7k6 gold badges45 silver badges95 bronze badges

Analytically, why does Sierpinski's triangle appear in Pascal's triangle?

Awarded yesterday

Descartes Before the Horse

7,3564 gold badges31 silver badges79 bronze badges

Multiplying permutation matrix by itself to get identity

Awarded yesterday

user2781994

1331 silver badge3 bronze badges

Upwind Schemes meaning

Awarded yesterday

Rosy

1,0877 silver badges29 bronze badges

Start and end point of a rotated ellipse

Awarded yesterday

Nick

1431 silver badge4 bronze badges

Measure of image of critical points set is equal 0

Awarded yesterday

Stephen Dedalus

1,7961 gold badge15 silver badges27 bronze badges

generating a random periodic function with bounded amplitude and bounded fourier coefficients

Awarded yesterday

Jason S

3,1791 gold badge23 silver badges32 bronze badges

How is $\cos (\pi/2+h)$ equal to $-\sin(h)$? [duplicate]

Awarded yesterday

Shaikh Sakib

391 silver badge6 bronze badges

Is a closure a disjoint union of limit points and isolated points

Awarded yesterday

jakeoung

1,34118 silver badges31 bronze badges

Does a differentiable clustering algorithm exist?

Awarded yesterday

Kevin Meier

1,56511 silver badges27 bronze badges

Bounding "Jensen's Gap": Elementary Approaches

Awarded yesterday

Small Deviation

2,4321 gold badge6 silver badges24 bronze badges

Using the topology of uniform convergence for functions over non-compact spaces

Awarded yesterday

iheap

2934 silver badges12 bronze badges

Why do we need boundary conditions in PDE's?

Awarded yesterday

user56834

12.2k13 gold badges51 silver badges144 bronze badges

Is "If a | bc, then a | b or a | c" valid?

Awarded yesterday

Spencer

131 silver badge4 bronze badges

Understanding an example of a subobject classifier.

Awarded yesterday

Shaun♦

47.6k20 gold badges73 silver badges187 bronze badges

Degree of Precision Effect on Quadrature Accuracy

Awarded yesterday

Sam Manzer

2551 gold badge3 silver badges8 bronze badges

Two definitions of set of class $C^1$, given in books by Brezis and Evans

Awarded yesterday

D1X

2,3322 gold badges19 silver badges40 bronze badges

Understanding a proof that the topologist's sine curve is not path connected.

Awarded 2 days ago

Curious student

6,8854 gold badges27 silver badges71 bronze badges

Multivariate Dirac delta function

Awarded 2 days ago

Make42

1,22910 silver badges18 bronze badges

First Order Approximation Taylor Series

Awarded 2 days ago

MathStudent

1,41013 silver badges23 bronze badges

Integral $\int_0^{\pi/4} \frac{\ln \tan x}{\cos 2x} dx=-\frac{\pi^2}{8}.$

Awarded 2 days ago

Jeff Faraci

10.3k2 gold badges38 silver badges117 bronze badges

Is 'level one chaos', as Yuval Noah Harari describes, a real concept in chaos theory?

Awarded 2 days ago

Nico Damascus

1711 silver badge4 bronze badges

Example of orthogonal parametrization of a surface

Awarded 2 days ago

kolahalb

1011 silver badge2 bronze badges

Gaussian integral with error function

Awarded 2 days ago

MariNala

2412 silver badges7 bronze badges

A cycle and a cutset intersect in an even number of edges in a graph $G$

Awarded 2 days ago

IntegrateThis

3,9472 gold badges28 silver badges75 bronze badges

There is a prime between $n$ and $n^2$, without Bertrand

Awarded 2 days ago

Wojowu

27.5k2 gold badges50 silver badges114 bronze badges

Superencrypting an affine cipher

Awarded 2 days ago

Jackson Hart

1,6302 gold badges21 silver badges33 bronze badges

What are some good university level texts with solutions?

Awarded 2 days ago

robotsheepboy

1891 silver badge15 bronze badges

Euler-Lagrange equation in polar or cylindrical coordinates

Awarded 2 days ago

user1887239

131 silver badge3 bronze badges

Stokes' Theorem to evaluate intersection of cylinder and plane.

Awarded 2 days ago

7-3KD

1012 silver badges8 bronze badges

Ways to prove $ \int_0^\pi \frac{\sin^2 nx}{\sin^2 x} dx= n\pi$

Awarded 2 days ago

user111187

5,9311 gold badge20 silver badges52 bronze badges

Show that $\prod (1- P(A_n))=0$ iff $\sum P(A_n) = \infty$

Awarded 2 days ago

user179454

451 silver badge6 bronze badges

Markov Chain Expectation Variance Covariance

Awarded 2 days ago

student_from_eindhoven

551 silver badge4 bronze badges

Number of lines to connect $n \times n$ dots

Awarded 2 days ago

Krijn

1,99518 silver badges35 bronze badges

Prove that $a$ is a primitive root $\bmod{p}$ if and only if $-a$ has order $\frac{p-1}{2}$

Awarded 2 days ago

Rachel162

1883 silver badges8 bronze badges

Exercise 2.2.1 in Charles A. Weibel's book An Introduction To Homological Algebra

Awarded 2 days ago

user150245

1351 silver badge6 bronze badges

Finding a sequence $a_n$ such that $\sum a_n$ converges but $\sum a_n^3$ diverges. [duplicate]

Awarded 2 days ago

Quantaliinuxite

1,55712 silver badges23 bronze badges

2 3 4 5

…

1682 Next