Mathematics Stack Exchange

0

votes

1

answer

16

views

Uncertainty of a Weighted Mean with Uncertain Weights

standard-deviation means error-propagation

modified 4 mins ago Ian 78.8k

0

votes

1

answer

13

views

Painting the edges of an $n$-gonal prism with 3 colors all the edges of each vertex have different colors if $n= 2018$ and $n= 2019$?

graph-theory

modified 4 mins ago Ross Millikan 340k

0

votes

0

answers

4

views

Independence of events in Bernoulli Probability Space

measure-theory

asked 4 mins ago user1333549 5

0

votes

2

answers

22

views

Are regular/Riemann integrals a special case of a line integral?

integration multivariable-calculus vector-analysis riemann-integration line-integrals

answered 6 mins ago zkutch 2,626

4

votes

1

answer

47

views

Is there a function that grows slower than the factorial function and whose derivative grows faster than the function itself?

calculus limits functions derivatives factorial

modified 6 mins ago Integrand 5,676

0

votes

0

answers

4

views

Understanding the $\alpha$ existence in the definition of the boundary map in case of simplicial homology and its absence in singular homology.

algebraic-topology definition homology-cohomology homological-algebra group-cohomology

asked 8 mins ago Smart20 437

0

votes

0

answers

11

views

Series going to $+\infty$

real-analysis calculus sequences-and-series

asked 8 mins ago Robert890 101

1

vote

1

answer

25

views

Transient, Positive Recurrent, or Null Recurrent

probability statistics markov-chains

modified 9 mins ago Math1000 29.2k

3

votes

1

answer

60

views

In infinite dimensions, is it possible that convergence of distances to a sequence always implies convergence of that sequence?

metric-spaces banach-spaces normed-spaces cauchy-sequences

modified 9 mins ago Nikhil Sahoo 556

0

votes

0

answers

26

views

Is this graphing calculator broken, or is this someting really weird?

chaos-theory

modified 10 mins ago Henry 118k

2

votes

0

answers

13

views

$L = \lim \limits_{T\to \infty} \frac{1}{T}\int \limits_{-T/2}^{T/2} cos(\omega t + \theta)~dt$

calculus limits

asked 11 mins ago pico 469

6

votes

1

answer

85

views

Proving $\log\left(\frac{4^n}{\sqrt{2n+1}{2n\choose n+m}}\right)\geq \frac{m^2}{n}$

combinatorics inequality logarithms combinatorial-proofs

modified 16 mins ago Blue 59.2k

0

votes

0

answers

7

views

Is this a valid strategy to find group new group automorphisms given you already know some?

abstract-algebra automorphism-group

asked 17 mins ago Ty Jensen 864

1

vote

1

answer

15

views

Injection from $(K\otimes_{\mathbb{Z}}\hat{\mathbb{Z}})^\to \prod_p(K\otimes_{\mathbb{Z}}\mathbb{Z}_p)^$?

algebraic-number-theory tensor-products class-field-theory profinite-groups

answered 19 mins ago WhatsUp 9,866

3

votes

1

answer

27

views

Is the determinant a tensor?

linear-algebra determinant tensors tensor-rank

answered 21 mins ago Maximilian Janisch 9,008

1

vote

1

answer

39

views

Proving continuity at the end points of the extension of a continuous function

real-analysis general-topology proof-writing solution-verification

modified 23 mins ago Ricky_Nelson 845

0

votes

1

answer

27

views

Lebesgue Measure Space and a converging, increasing sequence. Show that the sequence in increasing.

measure-theory lebesgue-measure

modified 28 mins ago amWhy 198k

0

votes

1

answer

26

views

Question about proof of Cauchy's inequality in complex analysis.

complex-analysis complex-numbers proof-explanation

answered 28 mins ago Pythagoras 3,783

0

votes

0

answers

8

views

Determine Whether a Metric is Separable, Complete,or Compact

metric-spaces

modified 29 mins ago N. Bar 1,334

11

votes

1

answer

1k

views

Classification of triply transitive finite groups

group-theory finite-groups permutations

modified 29 mins ago Community♦ 1

0

votes

1

answer

22

views

Are chain complexes chain equivalent to free ones?

homological-algebra

answered 30 mins ago Yuta 43

0

votes

0

answers

12

views

Does there exist a function which is real-valued, non-negative and bandlimited?

analysis fourier-analysis harmonic-analysis

asked 31 mins ago Muzi 892

0

votes

0

answers

8

views

Uniqueness of measures related to the Stieltjes transforms

measure-theory moment-problem

asked 33 mins ago James 185

0

votes

1

answer

38

views

Tossing coin until seeing n+1 many heads

probability probability-distributions

modified 36 mins ago anonymous 31

2

votes

1

answer

31

views

The Grothendieck-Serre Correspondence : Obstructions to the construction of the cyclic group of order 8 as a Galois group?

group-theory field-theory galois-theory

answered 38 mins ago TokenToucan 4,201

1

vote

0

answers

22

views

How do you take the derivative $\frac{d}{dx} \int_a^x f(x,t) dt$?

calculus integration derivatives

asked 41 mins ago Zachary Feng 105

2

votes

0

answers

11

views

References on tetrahedra

reference-request

modified 41 mins ago Alo 33

1

vote

1

answer

13

views

Neyman–Pearson Lemma

statistics hypothesis-testing

modified 42 mins ago Michael Hardy 237k

11

votes

0

answers

41

views

The complexity of finiteness

logic set-theory model-theory axiom-of-choice second-order-logic

modified 48 mins ago Noah Schweber 169k

0

votes

0

answers

6

views

Questions about GSADF and BASDF test's parameters

statistics regression programming

asked 49 mins ago Diricksen 1

7

votes

0

answers

210

views

+100

Discretization formula for system of two differential equations. “Solution to one of these is the initial condition of the other”. In which sense?

ordinary-differential-equations probability-theory numerical-methods stochastic-differential-equations numerical-calculus

modified 50 mins ago Strictly_increasing 317

0

votes

1

answer

11

views

Time Average Mean of X(t)=A, where A is a r.v. Ergodic vs. non-ergodic.

stochastic-processes

answered 52 mins ago pico 469

2

votes

1

answer

18

views

Prove/disprove that $ \mathbb{R}^2 / $~ is hausdorff, when: $(x_1,x_2) $~$(y_1,y_2)$ if there is $t>0$ such that $x_2 = tx_1 $ and $ty_2 = y_1$

general-topology quotient-spaces hausdorff-measure

modified 53 mins ago Vercassivelaunos 1,148

0

votes

0

answers

8

views

Numerical differentation - finding maxima

derivatives numerical-methods maxima-minima

asked 55 mins ago Leif 1,335

0

votes

0

answers

13

views

The name of a problem from formal language theory

algorithms formal-languages

asked 57 mins ago Elmar Guseinov 503

0

votes

0

answers

18

views

Problem computing integral of a 2D gaussian ring

integration gaussian-integral python gaussian

modified 1 hour ago Julien Drevon 1

-1

votes

0

answers

8

views

Find proper subsets as set coverings with coefficients

combinatorics combinatorial-proofs

asked 1 hour ago zxclkjqwe 1

5

votes

2

answers

191

views

What is the derivative of $\log \det X$ when $X$ is symmetric?

matrices derivatives determinant

answered 1 hour ago Alex Williams 248

5

votes

0

answers

37

views

Lie group theory's connection to fractional calculus?

lie-groups fractional-calculus

modified 1 hour ago jnez71 3,469

1

vote

0

answers

6

views

What are evaluation metrics for regression-type neural net?

machine-learning regression neural-networks error-function mean-square-error

asked 1 hour ago Capo Pavel Mestre 127

0

votes

0

answers

11

views

Piecewise regular curves

real-analysis

asked 1 hour ago Leonardo 1

0

votes

0

answers

30

views

Braided Monoidal Category Axioms

category-theory

modified 1 hour ago jgon 24.4k

1

vote

1

answer

19

views

Special Case of Independence for Joint Densities

probability probability-theory discrete-mathematics probability-distributions proof-explanation

answered 1 hour ago Robert Israel 383k

1

vote

0

answers

14

views

Probability of the average lifetime of $n$ machines

probability probability-distributions

asked 1 hour ago Sol 47

0

votes

0

answers

12

views

Conversion of relative pitch and yaw angle to screen coordinates

transformation

modified 1 hour ago Xander Henderson 20k

1

vote

2

answers

19

views

Find ideal, char and subring

abstract-algebra ring-theory ideals characteristics

answered 1 hour ago k.stm 15.8k

1

vote

0

answers

26

views

Is there a specific name for this geometrical shape?

geometry terminology

asked 1 hour ago Neeku 111

3

votes

1

answer

27

views

Center of of a subalgebra of a lie algebra: Under what conditions is $Z(\mathfrak{h})=Z(\mathfrak{g})\cap \mathfrak{h}$

abstract-algebra lie-algebras semisimple-lie-algebras

answered 1 hour ago Torsten Schoeneberg 10.8k

-1

votes

0

answers

6

views

Solving a functional equation (in 2D)

functional-analysis functional-equations functional-calculus

asked 1 hour ago sara nj 288

3

votes

1

answer

71

views

How to obtain a solution for the following IBVP

ordinary-differential-equations partial-differential-equations boundary-value-problem heat-equation deconvolution

modified 1 hour ago Petroleum Engineer 41

1

vote

0

answers

44

views

+100

Geometry of Riemannian quotient manifold $St(\mathbb{C}^{n \times p},B)/U(1)^{\times p}$

riemannian-geometry

modified 1 hour ago cjferes 1,594

1

vote

0

answers

32

views

Discussion of continuous functions in topology

real-analysis general-topology analysis continuity metric-spaces

asked 1 hour ago Saaqib Mahmood 20.1k

0

votes

0

answers

12

views

Laplace transform of a modified generalised logistic function

functions laplace-transform

modified 1 hour ago bajkiszon 1

2

votes

0

answers

32

views

Formulas for the Spinor Representation Product Decompositions $2^{[\frac{N-1}{2}]} \otimes 2^{[\frac{N-1}{2}]}=?$ and …

group-theory differential-geometry representation-theory lie-groups spin-geometry

modified 1 hour ago wonderich 4,675

0

votes

0

answers

9

views

Relatively compact set in $l_1$

functional-analysis

asked 1 hour ago 2132123 854

0

votes

0

answers

11

views

Time Series Normalization & Where to Start

regression time-series

asked 1 hour ago FamousAv8er 101

0

votes

0

answers

12

views

Can closed forms for the outputs in this production simulation be found?

elementary-number-theory modular-arithmetic ceiling-and-floor-functions simulation

asked 1 hour ago SmallestUncomputableNumber 1,439

3

votes

2

answers

46

views

Is an automorphism a function or a group?

abstract-algebra group-theory automorphism-group

answered 2 hours ago Ethan Bolker 65.1k

1

vote

0

answers

27

views

Maximizing the Leontief inverse

linear-algebra optimization convex-optimization inverse nonlinear-optimization

modified 2 hours ago user_lambda 936

0

votes

0

answers

21

views

Why is this deformation retract well-defined?

general-topology manifolds geometric-topology compact-manifolds cobordism

asked 2 hours ago user810809 1

1

vote

1

answer

34

views

Existence of basis for $L^2(\mathbb{S}^1,\mu)$, where $\mu$ is arbitrary, for which Riemann-Lebesgue lemma is true.

real-analysis functional-analysis fourier-analysis

modified 2 hours ago Oliver Diaz 6,785

0

votes

0

answers

13

views

Is this injective projection map open?

differential-geometry algebraic-geometry complex-geometry

asked 2 hours ago Longma 1

0

votes

0

answers

11

views

Anti-symmetric representation of $SO(2n)$ to $SU( n)$

abstract-algebra group-theory representation-theory lie-groups lie-algebras

asked 2 hours ago annie heart 2,085

0

votes

0

answers

22

views

Fundamental Theorem of Projective Geometry for Finite Fields

algebraic-geometry projective-geometry

asked 2 hours ago am2000 1

0

votes

0

answers

13

views

How to impose constraint on quadratic equation fit based on their parameters?

quadratics regression python

modified 2 hours ago RobPratt 13.7k

1

vote

0

answers

15

views

Number of events in a series of Poisson processes?

probability poisson-process

modified 2 hours ago RobPratt 13.7k

1

vote

1

answer

24

views

Understanding the multidimensional chain rule

multivariable-calculus chain-rule

answered 2 hours ago Vercassivelaunos 1,148

1

vote

0

answers

8

views

Term for 3D Surface Mapped into 2D Plane

geometry differential-geometry terminology

modified 2 mins ago Mark S. 14.8k

0

votes

0

answers

19

views

What is the name of this irregular 8-faced convex polyhedron?

geometry terminology polyhedra

modified 2 hours ago Blue 59.2k

0

votes

0

answers

15

views

Derivative of vectorized function wrt to a Cholesky decompositiion

derivatives matrix-calculus jacobian cholesky-decomposition vectorization

modified 2 hours ago Rodrigo de Azevedo 15.7k

1

vote

0

answers

33

views

Hopf surface as an elliptic surface over $\mathbb{P}^1$

algebraic-topology complex-geometry fiber-bundles

modified 2 hours ago 6666 3,525

1

vote

1

answer

20

views

Half-SAT/ Half-Satisfiability

discrete-optimization satisfiability

modified 2 hours ago MJD 57.3k

0

votes

0

answers

12

views

Removing coordinate singularities

differential-geometry differential-topology riemannian-geometry singularity

asked 2 hours ago user810809 1

0

votes

0

answers

34

views

Does $\int_1^\infty\frac{f_ng_n}{f_n^2+g_n}dx$ go to $0$ under these conditions of $f_n$ and $g_n$

real-analysis measure-theory measurable-functions

modified 2 hours ago alphaomega 1,097

1

vote

1

answer

18

views

The closed form solution to the equation with sum of exponential functions

solution-verification riemann-sum monotone-functions exponential-sum

answered 2 hours ago Robert Israel 383k

0

votes

0

answers

14

views

Proof of continuity of paramtric integral via sequences

real-analysis integration analysis continuity

modified 2 hours ago Philipp 964

0

votes

0

answers

15

views

How to check if a differential operator is translation invariant practically?

differential-geometry greens-function

asked 2 hours ago Lelouch 726

3

votes

0

answers

33

views

Why is it called the “sampling distribution of the mean”?

statistics descriptive-statistics

modified 2 hours ago JCAA 4,525

0

votes

2

answers

56

views

If $\lim_{n\to\infty}|a_{n+1}/a_n|=L$, then $\lim_{n\to\infty}|a_n|^{1/n}=L$

calculus sequences-and-series limits

answered 2 hours ago Ted Shifrin 81.1k

2

votes

1

answer

29

views

What does integral and rational mean in the following text?

algebra-precalculus

answered 3 hours ago Kenny Wong 22.2k

1

vote

0

answers

22

views

Condition number - eigenvalues

condition-number

modified 3 hours ago Ben Grossmann 165k

0

votes

0

answers

11

views

Homology of infinite Koszul complex tensored with an injective module vanishes

abstract-algebra homology-cohomology homological-algebra

asked 3 hours ago Ivon 811

7

votes

2

answers

114

views

+50

Finding the limit of $\mathbb{E}[\theta^n]/\mathbb{E}[\theta^{n-1}]$

probability limits expected-value

modified 3 hours ago Sangchul Lee 118k

0

votes

0

answers

10

views

Least squares coordinate-wise smoothness

convex-optimization norm least-squares

asked 3 hours ago muhmad 25

0

votes

0

answers

8

views

Generating Function for sum of N dice [or other multinomial distribution] where lowest N values are “dropped” or removed

probability combinatorics generating-functions multinomial-coefficients multinomial-distribution

asked 3 hours ago rasher 545

2

votes

0

answers

19

views

Containment of Bruhat cells on flag variety

algebraic-geometry algebraic-groups

modified 3 hours ago Qixian Zhao 153

5

votes

0

answers

55

views

Second cohomology group of an affine Lie algebra

representation-theory lie-algebras group-cohomology

modified 3 hours ago B. Pasternak 1,728

5

votes

0

answers

54

views

What's nonsensical about this definition of the order of a meromorphic function?

complex-geometry several-complex-variables

modified 3 hours ago Ted Shifrin 81.1k

3

votes

1

answer

20

views

Integral of a product of Bessel functions of the first kind

integration improper-integrals bessel-functions wolfram-alpha approximate-integration

modified 3 hours ago Michael Seifert 6,611

2

votes

0

answers

26

views

Evaluating S depending upon following condition: Calculate the sum $S=\Sigma \Sigma \Sigma x_{i} x_{j} x_{k},$

summation solution-verification

modified 3 hours ago Amartya Roy 1,449

1

vote

1

answer

18

views

Evaluating an improper integral - issues taking the cubic root of a negative number

calculus integration

answered 3 hours ago Poorwelsh 56

3

votes

0

answers

22

views

Is it true that if $P(\int_0^T f^2(s) ds<\infty)=1$ then the exponential defines a density?

probability stochastic-processes stochastic-calculus stochastic-analysis

asked 3 hours ago user658409 1,272

2

votes

1

answer

26

views

Right adjoint to the forgetful functor $\text{Ob}$

category-theory adjoint-functors

modified 3 hours ago Shaun 23.6k

0

votes

0

answers

18

views

Particular matrix $A$ has infinitely many LU factorizations

linear-algebra matrices gaussian-elimination

modified 4 hours ago Rodrigo de Azevedo 15.7k

2

votes

1

answer

25

views

How does this function arrive while formulating the auxiliary inequality for proof of $\mathcal {L^p}$ as a metric space?

functional-analysis metric-spaces banach-spaces normed-spaces

modified 4 hours ago Ralph Clausen 585

3

votes

1

answer

31

views

Elementary block matrix operations to block-triangularize block tridiagonal matrix

matrices systems-of-equations block-matrices tridiagonal-matrices

answered 4 hours ago Ben Grossmann 165k

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