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20

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Thales Application

euclidean-geometry

modified 1 min ago Sinπ 750

6

votes

2

answers

61

views

Construct a nonabelian group of order 44

abstract-algebra group-theory sylow-theory group-presentation

answered 2 mins ago Travis 64.6k

1

vote

1

answer

41

views

Find $\int_0^{\frac{\pi}{2}} \frac{\sqrt{3-(\cos x)^{2}}}{\sin x + \cos x}dx$

integration trigonometry definite-integrals closed-form

answered 6 mins ago Claude Leibovici 126k

1

vote

1

answer

23

views

Absolute value theorem for sequences

sequences-and-series

answered 6 mins ago BadAtGeometry 254

0

votes

0

answers

10

views

Showing that triangle inequality holds/fails for a norm-like function

real-analysis calculus integration measure-theory inequality

modified 8 mins ago CuriousKid7 1,724

-2

votes

0

answers

5

views

Hausdorff dimension of subset of cartesian product

measure-theory

asked 15 mins ago Newbie 455

1

vote

1

answer

6

views

Complex velocity of line vortex, simplification

fluid-dynamics several-complex-variables

modified 18 mins ago WnGatRC456 113

0

votes

0

answers

4

views

Prove or disprove that $Y_n/n$ converges in probability to 0

statistics statistical-inference

asked 18 mins ago LegendOfKass 6

0

votes

0

answers

10

views

A Poincare-like inequality

real-analysis pde

asked 19 mins ago bdl10 33

0

votes

1

answer

15

views

Inertia and Decomposition Field in $\mathbb{Q}(\omega=exp(2\pi i/m)$, where $m=p^{k}n,(p,n)=1$.

algebraic-number-theory

modified 21 mins ago reuns 21k

1

vote

1

answer

15

views

Question about the FFT version of the gradient of a function.

numerical-methods fourier-transform fast-fourier-transform numerical-calculus

modified 23 mins ago Spencer 8,848

1

vote

0

answers

12

views

ODE in $\mathbb{R}^n$ defined by the gradient of a function

ordinary-differential-equations multivariable-calculus

asked 25 mins ago Nuntractatuses Amável 623

0

votes

0

answers

10

views

Searching for a certain one form

multivariable-calculus differential-geometry differential-topology differential-forms

asked 27 mins ago user666635 1

0

votes

1

answer

9

views

Need help with relation properties using logical operators

discrete-mathematics logic relations predicate-logic

modified 27 mins ago William Elliot 9,256

0

votes

0

answers

5

views

Using measurement scales with sets of data

statistics

asked 29 mins ago ryp 1

0

votes

1

answer

27

views

Derivative of $f(z)=z^{\frac{1}{2}}$

complex-analysis

answered 34 mins ago Tengu 2,674

0

votes

2

answers

5k

views

Finding the angle b/w two lines in Coordinate Geometry

analytic-geometry

modified 36 mins ago Community♦ 1

2

votes

1

answer

36

views

Combinatorics: Existence of a Latin Square

combinatorics graph-theory coloring latin-square

modified 38 mins ago bof 52.6k

0

votes

2

answers

31

views

Why is uniqueness a requirement for well-posed problems?

numerical-methods

answered 40 mins ago Erick Wong 20.6k

1

vote

1

answer

13

views

Proper Ideals with Norm Relatively Prime to Conductor

abstract-algebra number-theory ring-theory algebraic-number-theory

modified 46 mins ago rogerl 18.1k

-2

votes

0

answers

12

views

UMVUE of Geometric Distribution

statistics estimation parameter-estimation

asked 53 mins ago Autumn 4

0

votes

1

answer

11

views

Poset and lattice

discrete-mathematics

answered 57 mins ago William Elliot 9,256

0

votes

2

answers

26

views

Prove: $f$ is injective if and only if for any non-empty set $C$ and for all functions $g, h : C \to A$ such that $f ◦ g = f ◦ h$ we have $g = h$.

elementary-set-theory elementary-functions

modified 58 mins ago abcdefg 529

0

votes

0

answers

13

views

cubic Hermite interpolation

interpolation cubic-equations hermite-polynomials hermite-normal-form

asked 1 hour ago Viking 6

0

votes

0

answers

10

views

Size of conjugacy class of a quotient group

finite-groups quotient-group

asked 1 hour ago daruma 937

1

vote

0

answers

30

views

If $x_n \rightarrow x \implies \lim_{n \rightarrow +\infty}$ $f_n (x_n) \rightarrow f(x)$ ,then $f_n \rightarrow f$ uniformly in each compact set $K $

real-analysis proof-verification proof-explanation uniform-convergence

modified 1 hour ago Jess 47

1

vote

0

answers

40

views

How to combine shuffles to prove associativity of Eilenberg-Zilber map

combinatorics algebraic-topology permutations shuffles

modified 1 hour ago Ethan Bolker 46.6k

2

votes

0

answers

44

views

Sheaf of a Closed Subset

algebraic-geometry sheaf-theory affine-geometry affine-varieties

modified 1 hour ago Dave 91

0

votes

1

answer

36

views

How to use the Weak Law of Large Numbers to show this?

variance

answered 1 hour ago lonza leggiera 1,554

0

votes

0

answers

5

views

Solving a linear system up to scaling

linear-algebra matrices matrix-equations

asked 1 hour ago Jollywatt 145

1

vote

0

answers

10

views

Lowest Unique Ordinal Game

game-theory ordinals nash-equilibrium

asked 1 hour ago user263190 808

0

votes

1

answer

22

views

Determining Graph Automorphisms by Determining Ways of Permuting Edges

graph-theory symmetry

modified 1 hour ago Saad 20.9k

1

vote

2

answers

27

views

Related to angles in tetrahedron

euclidean-geometry

modified 1 hour ago Saad 20.9k

2

votes

2

answers

47

views

''Homomorphism'' of rings

abstract-algebra

answered 1 hour ago Tengu 2,674

1

vote

0

answers

18

views

Chain rule for a transformation from $\mathbb{C}$ or $\mathbb{C}^2$ to $\mathbb{R}^2$

complex-analysis multivariable-calculus

modified 1 hour ago 0706 472

0

votes

0

answers

11

views

Finding Limiting Distribution $Z_n = \sqrt{n}(\tilde{\theta} - \theta)$

statistics statistical-inference

modified 1 hour ago LegendOfKass 6

5

votes

2

answers

1k

views

Quadric surfaces and transformation matrices

algebraic-geometry

modified 1 hour ago Community♦ 1

0

votes

0

answers

9

views

Relationship between locally trivial and locally non vanishing section.

differential-geometry algebraic-topology vector-bundles

modified 1 hour ago user124697 640

1

vote

1

answer

20

views

Distribution of arrival times of Poisson point processes

probability probability-distributions poisson-distribution

modified 1 hour ago David Stevens 44

0

votes

0

answers

6

views

Efficient matrix inversion after update when the size of the components changes

matrices covariance

asked 1 hour ago Gavin 13

1

vote

1

answer

31

views

Sum of two random variables uniformly distributed on circles

probability probability-theory

answered 1 hour ago Einar Rødland 6,526

0

votes

0

answers

12

views

Changing to slanted coordinates

partial-derivative

modified 1 hour ago Saru 135

0

votes

0

answers

44

views

The circles are similar in the plane, so are the circles similar on the sphere?

geometry differential-geometry euclidean-geometry

modified 1 hour ago E.wei 26

1

vote

0

answers

13

views

Cartan homotopy formula and curl

calculus differential-geometry vector-analysis homotopy-theory differential-forms

asked 2 hours ago Lo Scrondo 197

1

vote

0

answers

18

views

Random Graphs - Planarity

graph-theory random-graphs

asked 2 hours ago KingJ 516

3

votes

1

answer

57

views

+150

Understanding Optimal Transport in One Dimension.

real-analysis probability-theory measure-theory pde optimization

modified 2 hours ago Max 4,707

1

vote

0

answers

26

views

Question of the Cholesky decomposition of symmetric positive definite matrix

linear-algebra matrices eigenvalues-eigenvectors matrix-decomposition positive-definite

modified 2 hours ago Edward Z. Miao 18

0

votes

1

answer

23

views

Volume of surface Revolution by area bounded by $y=\sin(x)$ and $y=0$

integration trigonometry definite-integrals volume

answered 2 hours ago peterwhy 12.5k

1

vote

1

answer

14

views

Optimising unrounding using maximum likelihood

statistics maximum-likelihood

answered 2 hours ago Henry 102k

1

vote

0

answers

14

views

Name of Hardy Littlewood Lemma/Result

complex-analysis reference-request riemann-zeta

asked 2 hours ago Santiago Estupiñán 80

0

votes

1

answer

16

views

Why isn't $[P]_{C \leftarrow B}[T(x)]_{B}$ equal to $[T(x)]_C$ ? $P$ is the change of basis matrix from $B$ to $C$ and $T$ is a linear transformation

linear-algebra matrices linear-transformations change-of-basis

modified 2 hours ago amd 32.1k

0

votes

0

answers

26

views

Does it make sense to speak in a total derivative of a functional?

physics mathematical-physics functional-calculus

modified 2 hours ago Alexsandro Lucena Mota 1

1

vote

0

answers

10

views

Sufficient statistics and natural parameters of exponential family

probability analysis statistics probability-distributions distribution-theory

asked 2 hours ago Benjiaming Fung 141

0

votes

1

answer

10

views

Dart board probability using line method with Poisson application

probability self-learning poisson-distribution

answered 2 hours ago George Dewhirst 1,607

1

vote

0

answers

9

views

Something like the Wilson confidence interval, but taking into account the “typical” success rate?

statistics

asked 2 hours ago Bob Vesterman 106

0

votes

1

answer

24

views

Computing partial derivatives of $f(a,b)= \int_{0}^{1}(ax+b+\frac{1}{1+x^2})^{2}dx$ using chain rule.

real-analysis calculus multivariable-calculus derivatives partial-derivative

modified 2 hours ago George Dewhirst 1,607

3

votes

2

answers

46

views

Simple process in Itô calculus

probability-theory stochastic-processes stochastic-calculus brownian-motion stochastic-integrals

modified 2 hours ago Mdoc 561

0

votes

1

answer

9

views

Nash equilibrium that is not subgame perfect in an infinitely repeated game?

game-theory nash-equilibrium

answered 2 hours ago Mdoc 561

0

votes

0

answers

9

views

Determining whether counting events is a renewal process

probability proof-verification

asked 2 hours ago Jac Frall 82

4

votes

1

answer

1k

views

Probability of finding specific set of coloured balls within larger set of random-drawn balls

combinatorics

modified 2 hours ago Community♦ 1

1

vote

0

answers

8

views

Question on finite propagation speed of solution of hyperbolic partial differential equation

hyperbolic-equations

asked 2 hours ago Anju George 128

0

votes

1

answer

15

views

Find a function sarting with a Lebesgue-Stieltjes measure

measure-theory

answered 2 hours ago Kavi Rama Murthy 76.9k

0

votes

1

answer

34

views

Prove that a half-plane is convex

convex-analysis

modified 2 hours ago Rodrigo de Azevedo 13.2k

0

votes

1

answer

12

views

Determining Equation based on 2 Points and Horizontal Asymptote

graphing-functions

modified 2 hours ago Quote Dave 35

0

votes

0

answers

5

views

error estimation, polynomial interpolation with equidistant support points

numerical-methods interpolation

asked 2 hours ago Cornman 3,851

2

votes

1

answer

21

views

“Passing Through Convex Combinations” - Constructing a Norm Convergent Net from a Weakly Convergent Net

functional-analysis banach-algebras

modified 2 hours ago Rhys Steele 8,055

0

votes

0

answers

25

views

How to divide data in half using linear line?

statistics

modified 2 hours ago Forextrader 98

-1

votes

0

answers

15

views

Brownian motion Wiener process expected first passage

probability

modified 3 hours ago J. W. Tanner 5,135

0

votes

0

answers

16

views

Calculate number of failures until success where the probability changes after a failure.

probability random-variables

asked 3 hours ago William Daniels 1

2

votes

0

answers

39

views

+50

Proving a property of a solution to a set of nonlinear polynomial equations

reference-request generating-functions nonlinear-system

modified 3 hours ago Mr. G 600

0

votes

0

answers

10

views

How to use Wald's equation to determine expectation in gambling model?

probability proof-verification gambling

asked 3 hours ago Jac Frall 82

2

votes

1

answer

25

views

Pell like equation solution

number-theory

answered 3 hours ago Eric Towers 33.9k

-1

votes

0

answers

14

views

On a second order non-linear differential equation

ordinary-differential-equations numerical-methods runge-kutta-methods

modified 3 hours ago Bernard 125k

0

votes

0

answers

21

views

Is $\int_1^{\infty} \frac{\sin(a \ln(u))}{u^{-b}} e^{-cu}du = \int_1^{\infty} \frac{\sin(a \ln(u))}{u^{-b}} e^{-\frac{c}{u}}du$

real-analysis definite-integrals

modified 3 hours ago Shree 95

-1

votes

0

answers

11

views

Periodic extension of real valued function and its Fourier series

fourier-analysis fourier-series

asked 3 hours ago 1bra 1

4

votes

1

answer

38

views

+50

Is this stochastic Picard iterator well-defined?

stochastic-processes stochastic-calculus brownian-motion sde

answered 3 hours ago Rhys Steele 8,055

1

vote

1

answer

14

views

A sequence $ (x_{n})$ is convergent in $X$ $\iff$ $ (x_{n})$ is a stationary sequence. Does $X$ have to be discrete?

general-topology

answered 3 hours ago Kavi Rama Murthy 76.9k

2

votes

1

answer

18

views

Show that $\varphi: \overline{E} \times K \longrightarrow N$ is continuous

proof-verification continuity metric-spaces

modified 3 hours ago George 918

0

votes

0

answers

11

views

Is the following knapsack modelling correct (with two different types of constraints)

linear-programming

asked 3 hours ago Snowflake 143

1

vote

0

answers

17

views

Advantage of using Hidden Markov Model over Markov Chain

markov-chains hidden-markov-models

modified 3 hours ago jhon_wick 303

7

votes

2

answers

2k

views

Differences between Quaternion integration methods

integration quaternions bayesian-network kalman-filter runge-kutta-methods

modified 3 hours ago Community♦ 1

0

votes

0

answers

12

views

Solution for a constrained (v 1st & u 2nd) sum $\sum_{a=1, |au+v|\le N}^{N}\left(2\Bigl\lfloor{N/a}\Bigr\rfloor+1\right)\sum_{a=1,|au+v|\le N}^{N}N$

summation constraints

modified 3 hours ago Lorenz H Menke 96

47

votes

17

answers

12k

views

Why does the derivative of sine only work for radians?

calculus trigonometry derivatives

modified 3 hours ago Allan Henriques 70

0

votes

0

answers

13

views

Sampling distribution output does not look like a continuous function

algorithms sampling

modified 3 hours ago Telion 103

3

votes

0

answers

19

views

Find $f$ such that $f^{-1}(\lbrace0\rbrace)$ is a knotted curve

differential-topology smooth-manifolds submanifold

asked 3 hours ago Adam 118

0

votes

0

answers

5

views

Rigid motions taking a regular $n$-gon back to itself carry vertices to vertices

geometry symmetry dihedral-groups

asked 3 hours ago Paolo 639

1

vote

1

answer

17

views

Find a and b given that $l_1$ and $l_2$ intersect at the midpoint of the line segment $\vec{AB}$

calculus vectors

answered 3 hours ago amd 32.1k

0

votes

0

answers

16

views

Vector spherical harmonics and resolution

spherical-harmonics

modified 4 hours ago D_J_S 56

1

vote

1

answer

48

views

What is the probability to be after $n$ random jumps of unit length in space within a distance of radius $r$ from the start?

probability-distributions

modified 4 hours ago kimchi lover 12.1k

1

vote

0

answers

24

views

Let $G$ be a group s.t. $|G|=pqr$ where $p,q,r$ are primes that need not be distinct. Prove that $G$ is soluble.

abstract-algebra group-theory

modified 4 hours ago the_fox 2,907

-3

votes

0

answers

23

views

Stabilizer, Orbit, Coset, Normalizer

group-theory

asked 4 hours ago gloster398 1

0

votes

0

answers

11

views

How do non-principal ultrafilters 'know' the key elements of an infinite series when establishing the equivalence for hyperreals.

nonstandard-analysis

modified 5 hours ago East 62

2

votes

0

answers

10

views

Is a stabilizer subgroup a symmetric subalgebra?

lie-algebras

modified 5 hours ago J. W. Tanner 5,135

2

votes

0

answers

25

views

A measure theoretic Lipschitz condition

functional-analysis measure-theory soft-question geometric-measure-theory

modified 5 hours ago Riku 155

0

votes

0

answers

8

views

Nonnegative matrix exercise by Minc

linear-algebra matrices nonnegative-matrices

asked 5 hours ago Alfdav 104

-1

votes

1

answer

9

views

Markov Process question

markov-process

answered 5 hours ago Mark Fischler 34.5k

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