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Is max {x1,x2,x3,…,xn} <=1 convex or not?

convex-optimization

answered 1 min ago Siong Thye Goh 111k

0

votes

0

answers

2

views

Why change of transformation matrix is unique

linear-algebra

asked 2 mins ago maths student 713

0

votes

0

answers

3

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Surface embedded into a smooth compact

riemannian-geometry

asked 4 mins ago Mike Q 18

0

votes

0

answers

9

views

Let $G$ be a group, and $H \le G$. For what pairs $(G,H)$ is $Z(H)=Z(G)\cap H$ true?

abstract-algebra group-theory

modified 4 mins ago Sabhrant 211

0

votes

0

answers

3

views

Square root and exponential of diagonalized matrix

matrices diagonalization matrix-decomposition

asked 6 mins ago mcExchange 113

0

votes

0

answers

4

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Weak convergent sequences and functionals.

functional-analysis weak-convergence

asked 6 mins ago tingting 1

1

vote

2

answers

12

views

Definition of a matrix by matching two vectors

matrices vectors

answered 6 mins ago Nitin Uniyal 4,483

0

votes

0

answers

5

views

Equation z^3=sqrt3+i

calculus

asked 6 mins ago Vasilis 6

0

votes

1

answer

11

views

Compute the value of the $30$th derivative of the function $g(x) = \sinh{\left(x^4\right)}$ at the origin, i.e. $g^{(30)}(0)$.

calculus

answered 8 mins ago Prototank 1,623

0

votes

0

answers

3

views

2nd Order ODE, variable coefficients, squared differential term.

ordinary-differential-equations

asked 10 mins ago Simplex1 396

0

votes

1

answer

22

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An elementary inequality for 3 positive real numbers

algebra-precalculus inequality holder-inequality

modified 11 mins ago Michael Rozenberg 128k

0

votes

0

answers

2

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comparison of projections in $B(H)$

operator-theory operator-algebras c-star-algebras von-neumann-algebras

asked 12 mins ago math112358 1,349

0

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1

answer

23

views

Finding $a,b$ in this limit without using L'Hopitals rule

limits

modified 14 mins ago lab bhattacharjee 239k

0

votes

1

answer

9

views

Calculating expected cost of a shipment

probability statistics expected-value hypergeometric-function

answered 14 mins ago saulspatz 25.8k

0

votes

0

answers

4

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How to find expected ratio from simulation?

probability

asked 14 mins ago danielmason 3

0

votes

2

answers

16

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algorithm for triangular surface elements enclosing random 3D points

geometry algorithms 3d random convex-geometry

modified 17 mins ago navin 6

0

votes

0

answers

5

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Maximize a limit, logarithmic utility

probability limits probability-theory logarithms utility

asked 17 mins ago MatthiasPichler 52

0

votes

0

answers

6

views

Prove of continuity in complex analysis setting

complex-analysis continuity

asked 18 mins ago Ben C. 28

0

votes

0

answers

5

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Floor function solve using any code/tool

discrete-mathematics

asked 18 mins ago GAURAV 1

0

votes

0

answers

8

views

Challenging sum: Compute $\sum_{n=0}^\infty\frac{(-1)^nH_{n/2}}{(2n+1)^2}$

integration sequences-and-series closed-form harmonic-numbers polylogarithm

modified 18 mins ago Ali Shather 5,219

0

votes

0

answers

6

views

Is the proposal sequence of the Metropolis-Hastings algorithm a Markov chain?

probability-theory measure-theory markov-chains markov-process

modified 20 mins ago 0xbadf00d 1,342

2

votes

2

answers

49

views

Why is variance squared rather than cubed (or any other exponent)?

statistics variance

answered 22 mins ago Asad 1

2

votes

0

answers

22

views

Standardizing a convex problem

optimization convex-optimization semidefinite-programming cvx

modified 26 mins ago Rodrigo de Azevedo 13.8k

1

vote

0

answers

5

views

Explicit isomorphism $A\to H_{n}(D^{n},S^{n-1};A)$.

algebraic-topology homology-cohomology

asked 27 mins ago richarddedekind 732

-1

votes

0

answers

7

views

Satisfiability of a set of closed wffs

logic

modified 28 mins ago Arthur 142k

5

votes

1

answer

67

views

+50

Betti numbers and dimension of socle of an ideal

commutative-algebra homological-algebra derived-functors

answered 29 mins ago Jake Levinson 3,615

0

votes

0

answers

6

views

well-poseness of Navier - Stokes in exterior domains

pde fluid-dynamics

modified 30 mins ago Riri 1

0

votes

1

answer

30

views

Finding the matrix of a linear transformation with respect to bases

linear-algebra matrices linear-transformations

answered 31 mins ago J. W. Tanner 17.9k

1

vote

1

answer

21

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For relatively prime $a$ and $b$, if a prime $p$ divides $a^n-b^n$ then we one of two cases

number-theory gcd-and-lcm mersenne-numbers

answered 31 mins ago астон вілла олоф мэллбэрг 43.3k

0

votes

0

answers

17

views

Estimation of autocovariance function for stationary times series

probability stochastic-processes random time-series

modified 37 mins ago Waney 97

0

votes

1

answer

13

views

How do I find the minimum value of the following expression?

circles maxima-minima

answered 38 mins ago José Carlos Santos 221k

1

vote

3

answers

19

views

Taylor series of $\sinh{(x)}$ at $\ln{(2)}$.

calculus power-series

modified 43 mins ago Jean-Claude Arbaut 16.9k

0

votes

0

answers

15

views

compute the sprectrum of the sum of orthogonal projections

functional-analysis operator-theory operator-algebras c-star-algebras

modified 45 mins ago math112358 1,349

2

votes

2

answers

32

views

Prove that $\chi_y = \prod\limits_{\sigma \in G} \left (X-\sigma(y) \right ).$

abstract-algebra ring-theory proof-writing field-theory galois-theory

modified 45 mins ago math maniac. 397

2

votes

0

answers

16

views

Any linear transformation $A = B + C$ where $B$ is diagonal and $C$ is nilpotent and $BC = CB$

linear-algebra eigenvalues-eigenvectors

asked 45 mins ago Andreo 423

0

votes

1

answer

17

views

How do we find a particular function f(x) has maximum or minimum on unlimited domain?

calculus maxima-minima

modified 48 mins ago daw 27.5k

0

votes

0

answers

7

views

Line integrals over conservative vector fields

vector-analysis

asked 49 mins ago kmzcx 1

0

votes

1

answer

61

views

Rolle's Theorem and vertical tangents

real-analysis derivatives continuity tangent-line rolles-theorem

modified 51 mins ago José Carlos Santos 221k

0

votes

1

answer

11

views

Examples of 1 dimensional noetherian rings that arent domains

ring-theory noetherian krull-dimension

modified 51 mins ago Wuestenfux 11.8k

1

vote

1

answer

13

views

How get the long-run proportion of times the vector is still $(1, 1,\dots, 1)$ which flips uniformly random?

probability analysis probability-theory stochastic-processes

answered 52 mins ago Arthur 142k

0

votes

1

answer

12

views

$(X,Z) \stackrel{D}{=} (Y,Z)$ implies $\mathbb{E}[f(X) \mid Z] = \mathbb{E}[f(Y) \mid Z]$ for any $f : \mathbb{R} \to \mathbb{R}$

probability-theory

answered 54 mins ago Stefan Hansen 21.4k

0

votes

0

answers

35

views

Term when some element $x$ has trivial stabilizer or isotropy subgroup. I think equivalent to a bijection between group $G$ and orbit $xG$

abstract-algebra group-theory terminology group-actions

modified 56 mins ago Selene Auckland 619

0

votes

1

answer

7

views

CW decomposition of 2-torus

general-topology algebraic-topology

answered 58 mins ago Arthur 142k

2

votes

0

answers

62

views

+50

Definitions of Measurability: Outer-inner measure convergence vs. Caratheodory criterion

real-analysis measure-theory lebesgue-measure outer-measure

modified 59 mins ago D.R. 2,310

4

votes

1

answer

39

views

Minimal possible order of a group that contains a specific subset

abstract-algebra combinatorics group-theory finite-groups

modified 59 mins ago Yanior Weg 4,675

0

votes

1

answer

15

views

A question about the space of functions the Ito integral is defined on

functional-analysis probability-theory stochastic-processes stochastic-calculus

answered 1 hour ago saz 89.8k

0

votes

0

answers

11

views

Both primal and dual have a unique optimal solution. Something wrong in the assumption/theorem/example?

optimization examples-counterexamples linear-programming duality-theorems

modified 1 hour ago Firepanda 8

0

votes

0

answers

5

views

How to prove f is quasiconvex if and only if its restriction to any line intersecting its domain is quasiconvex?

convex-optimization

asked 1 hour ago Solonius Quantus 1

0

votes

1

answer

12

views

FOL: Explaining truth of an argument using basic modal semantics

logic first-order-logic

modified 1 hour ago HallaSurvivor 1,543

0

votes

1

answer

6

views

Do the transformation have to have the same dimesion?

transformation

answered 1 hour ago Reveillark 5,337

0

votes

1

answer

12

views

How many sets must be included in the union that defines a connectivity relation?

discrete-mathematics elementary-set-theory relations

answered 1 hour ago Vsotvep 2,662

0

votes

1

answer

14

views

Divisibility of number of derangements $D(n)$ by $n-1$

elementary-number-theory

answered 1 hour ago darij grinberg 12.8k

1

vote

1

answer

8

views

Induced subgraphs of cycles

graph-theory

answered 1 hour ago Misha Lavrov 55.6k

0

votes

1

answer

14

views

What does a twice differentiable function mean?

calculus derivatives soft-question

modified 1 hour ago Kavi Rama Murthy 126k

1

vote

0

answers

20

views

What does the functional power series with $\text{zero sum}$ represent in mathematics and physical world?

summation power-series p-adic-number-theory

modified 1 hour ago M. A. SARKAR 2,774

0

votes

1

answer

16

views

Discrete Math (Proving by contradiction for sets)

discrete-mathematics

answered 1 hour ago A.J. 433

-1

votes

0

answers

13

views

Work to empty a half cylinder

calculus

modified 1 hour ago Robert Z 114k

7

votes

1

answer

141

views

+50

Do the squares of an arithmetic progression ever sum to a power of three?

number-theory elementary-number-theory

answered 1 hour ago mathlove 94.4k

0

votes

1

answer

10

views

Measure functional and Random variables

probability-theory measure-theory stochastic-processes stochastic-calculus

answered 1 hour ago Kavi Rama Murthy 126k

0

votes

0

answers

14

views

How can I graph the bouncing of a ball

graphing-functions education mathematical-modeling

asked 1 hour ago user10289295 1

0

votes

0

answers

10

views

What is the meaning of exponential term in the given model?

ordinary-differential-equations systems-of-equations mathematical-modeling biology delay-differential-equations

asked 1 hour ago stayhappy 13

0

votes

0

answers

26

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Singular Configurations of a Jacobian

linear-algebra proof-verification determinant matrix-rank jacobian

modified 1 hour ago user8396743 33

0

votes

0

answers

28

views

How would you find the global maximum and global minimum of f(x)?

calculus

modified 1 hour ago NoChance 5,117

0

votes

1

answer

24

views

Is the convex hull of a certain closed set closed?

real-analysis functional-analysis

answered 1 hour ago Kavi Rama Murthy 126k

3

votes

0

answers

41

views

+100

Dimension of commutator of an $n \times n$ matrix $A$ is $n$ implies that min poly and ch poly of $A$ coincides.

linear-algebra matrices field-theory

modified 1 hour ago user371231 473

1

vote

0

answers

15

views

function satisfying $\int^{\infty}_{-\infty}f(z,x,\theta)\:dz = e^{g(x, \theta)}$

integration

asked 1 hour ago Yusuke Otsubo 33

0

votes

1

answer

15

views

How to find the cube of a uniform distribution?

probability statistics uniform-distribution

modified 1 hour ago Graham Kemp 93.8k

0

votes

1

answer

19

views

Graph Theory - Perfect Matching

graph-theory

answered 1 hour ago Fuseques 79

-2

votes

1

answer

12

views

Probability (Calculating Variance)

probability

answered 1 hour ago Siong Thye Goh 111k

3

votes

0

answers

21

views

Rearrangement of Absolutely convergent series of series.

sequences-and-series absolute-convergence

asked 1 hour ago Jhon Doe 863

0

votes

1

answer

9

views

Complex Exponential Sequence (Discrete-time exponentials) factor equalling 1?

signal-processing

answered 1 hour ago user550103 1,093

0

votes

0

answers

5

views

loewnor,Schwarz–Christoffel.

complex-analysis complex-geometry

asked 2 hours ago Dearrest Honnor 1

0

votes

0

answers

17

views

Global mInima of a a multivariable vector function

multivariable-calculus numerical-methods vector-analysis maxima-minima

modified 2 hours ago user135580 188

0

votes

0

answers

12

views

What does the third derivative need to be at a boundary point for the point to be a local minimizer?

optimization convex-optimization

asked 2 hours ago mathnerd 120

0

votes

0

answers

13

views

Difference between a Fourier series and a Harmonic series.

fourier-series harmonic-functions

asked 2 hours ago Aakash Singh Bais 135

1

vote

1

answer

14

views

What are some non-trivial ways to construct a similar triangle from a right triangle?

soft-question euclidean-geometry

answered 2 hours ago Andrei 16.8k

1

vote

1

answer

18

views

Comparison of topologies defined on different spaces

general-topology

answered 2 hours ago MIN-CHUN WU 60

1

vote

0

answers

25

views

Solve Recursive Function

sequences-and-series discrete-mathematics recurrence-relations

asked 2 hours ago Hadi 6

1

vote

0

answers

15

views

Just and Weese I: Proof of Generalized Recursive Definitions

induction set-theory recursion

asked 2 hours ago Ron 6

0

votes

1

answer

62

views

What are the necessary and sufficient conditions for a real square matrix (not necessarily invertible) to have a strictly real arctangent?

linear-algebra matrices trigonometry matrix-calculus

modified 2 hours ago Just A Young Artist 24

1

vote

1

answer

12

views

Invertibility of a continuous operator minus its adjoint

real-analysis functional-analysis duality-theorems

modified 2 hours ago amsmath 5,527

1

vote

0

answers

7

views

Question about functions on the fibers of a finite unramified map

algebraic-geometry

asked 2 hours ago Math N00b 108

0

votes

0

answers

7

views

Minimizing sequence in descent methods

optimization convex-optimization gradient-descent

asked 2 hours ago Cm7F7Bb 13k

0

votes

0

answers

10

views

Integration involving some special functions

numerical-methods special-functions bessel-functions

asked 2 hours ago R. Bhattacharya 14

0

votes

2

answers

24

views

State a general law suggested

number-theory gcd-and-lcm

answered 2 hours ago lab bhattacharjee 239k

1

vote

2

answers

45

views

Find circumradius of an equilateral triangle of side 7$\text{cm}$

geometry triangles circles problem-solving osculating-circle

modified 3 hours ago Quanto 8,248

2

votes

1

answer

33

views

Measures equal on generating set

measure-theory

modified 3 hours ago Masacroso 14.1k

1

vote

1

answer

13

views

Finding nonzero global sections of a line bundle

algebraic-geometry vector-bundles projective-geometry projective-space homogeneous-equation

answered 3 hours ago diracdeltafunk 1,114

2

votes

0

answers

24

views

When $n\geq2$, let $a_n = \lceil \frac{n}{\pi}\rceil$ and let $b_n = \lceil{\csc({\frac{\pi}{n}})}\rceil$.

sequences-and-series discrete-mathematics ceiling-function

asked 3 hours ago eclipse221 11

23

votes

0

answers

728

views

Has category theory solved major math problems?

number-theory category-theory abelian-categories

modified 3 hours ago onurcanbektas 3,683

0

votes

1

answer

130

views

+50

What are invariant polynomials on $\mathfrak{gl} (r,F)$? Should $\varepsilon$ from polynomials to polynomial functions be injective?

abstract-algebra differential-geometry polynomials ring-theory vector-spaces

modified 3 hours ago Selene Auckland 619

-1

votes

0

answers

19

views

Cauchy-Schwarz and Bessel's inequality.

linear-algebra inequality inner-product-space cauchy-schwarz-inequality

modified 3 hours ago Martin Sleziak 46.9k

1

vote

0

answers

8

views

I am solving a differential equation with Gauss-Seidel method using NumPy and the solution seems to diverge.

algorithms numerical-linear-algebra python

asked 3 hours ago Lucas Seo 6

1

vote

1

answer

26

views

Prove for every $\alpha > 0$, the function $f'$ changes its sign in $(-\alpha, \alpha)$.

real-analysis derivatives continuity

answered 3 hours ago triple_sec 16.5k

4

votes

1

answer

31

views

Proving Quotient Space of Torus Homeomorphic to Klein Bottle

general-topology algebraic-topology klein-bottle

modified 4 hours ago Lee Mosher 60.9k

2

votes

0

answers

9

views

Formal Poisson summation formula

fourier-analysis fourier-transform poisson-summation-formula

modified 4 hours ago Singfook Sangwood 921

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