Mathematics Stack Exchange

0

votes

0

answers

3

views

Which rows of vectors are linearly dependent or linearly independent?

linear-algebra

asked 4 mins ago Bobber Joe 1

0

votes

0

answers

3

views

tracial state on a non-unital $C^*$ algebra

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

asked 6 mins ago mathrookie 586

1

vote

1

answer

101

views

Looking for a counterexample to demonstrate that a proposed theorem is false

real-analysis abstract-algebra examples-counterexamples real-numbers semigroups

modified 6 mins ago CopyPasteIt 3,421

-1

votes

0

answers

12

views

Prove that subgroup

abstract-algebra

asked 12 mins ago user499117 40

0

votes

1

answer

5

views

conjugacy for rate parameter of Gamma distribution

probability-distributions bayesian bayes-theorem gamma-distribution

answered 14 mins ago heropup 60.9k

0

votes

0

answers

7

views

Find the range of values at which the area between two curves is some given value

integration functions area

modified 17 mins ago NandyGirl 1

0

votes

3

answers

29

views

Poisson distribution function or not

probability-theory

answered 18 mins ago K Split X 4,026

0

votes

1

answer

25

views

Automorphism and center of a group

group-theory

modified 19 mins ago quasi 34.7k

1

vote

0

answers

12

views

How to Represent $L=-8\partial_1^2+4\partial_1\partial_2-\partial^2_2+3\partial_2$ as a Symmetric Matrix

linear-algebra elliptic-functions

asked 20 mins ago JulianAngussmith 21

3

votes

1

answer

33

views

Automorphisms on $(\mathbb R,+)$ and the Axiom of Choice

set-theory axiom-of-choice descriptive-set-theory

modified 20 mins ago CopyPasteIt 3,421

0

votes

2

answers

25

views

Closed sets: definition(s) and applications

real-analysis general-topology

answered 23 mins ago clmundergrad 61

0

votes

0

answers

17

views

How to convince someone with calculus or plots that the curve $x y - 1 = 0$ is connected over complexes?

algebraic-geometry complex-numbers connectedness path-connected

modified 24 mins ago AlexL 933

0

votes

1

answer

20

views

If x is a real number, then $x^2 ≥ 0$. The equality holds if and only if $x = 0$

number-theory

answered 28 mins ago RhythmInk 1,066

1

vote

0

answers

10

views

Application of the Principle of Inclusion-Exclusion

combinatorics

asked 28 mins ago J.Summer 47

1

vote

0

answers

13

views

What is the necessary and sufficient condion for a laplacian to be zero?

differential-equations multivariable-calculus differential-geometry mathematical-physics laplacian

modified 31 mins ago Bertrand Wittgenstein's Ghost 54

0

votes

0

answers

14

views

Existence of $v$ such that $f_i(v) = \delta_{i j} $

linear-algebra linear-transformations dual-spaces

asked 34 mins ago math.pr 13

0

votes

2

answers

12

views

Question related to the solution of Problem 3.49 (c) of Convex Optimization by Boyd and Vandenberghe

optimization convex-analysis convex-optimization

modified 44 mins ago Frank Moses 1,153

2

votes

0

answers

9

views

Is the category of finite-dimensional $k[x]$-modules a comodule category?

modules abelian-categories coalgebras

modified 45 mins ago Joppy 5,033

2

votes

1

answer

18

views

How can one calculate the distribution of this “multinomial” analog of the geometric distribution?

probability combinatorics proof-verification multinomial-coefficients

answered 45 mins ago Jeremy Dover 912

0

votes

2

answers

13

views

Diagonalization of Block Matrices

diagonalization

answered 46 mins ago Kapil Hari Paranjape 46

0

votes

1

answer

21

views

number of combinations colouring 10 eggs with 4 colours if one or 2 colours can be used at the same time

combinatorics coloring

answered 50 mins ago Xinye Bao 34

0

votes

2

answers

17

views

Statistical notation for random variables

combinatorics statistics notation

answered 51 mins ago David K 50.3k

1

vote

0

answers

21

views

Showing a Partial Differential Operator is Elliptic

linear-algebra differential-equations elliptic-equations

modified 54 mins ago Bell 223

2

votes

1

answer

26

views

Pove that the summation of iid sequence satisfies $\frac{S_n}{n\log n}\rightarrow c\quad \text{in probability}$

probability-theory law-of-large-numbers

answered 57 mins ago S.Wei 88

2

votes

1

answer

949

views

Vector space is decomposed into direct sum of its subspace and its orthogonal complement

vector-spaces bilinear-form

modified 1 hour ago Community♦ 1

0

votes

1

answer

9

views

Probability of joint distribution has closed form answer?

probability sequences-and-series probability-distributions conditional-probability geometric-probability

answered 1 hour ago Siong Thye Goh 88.2k

0

votes

1

answer

13

views

One-to-one of its domain and inverse is not continuous

real-analysis

answered 1 hour ago FFF 1

1

vote

1

answer

24

views

Show that $\lim$ us a right adjoint to the constant functor

category-theory limits-colimits adjoint-functors

modified 1 hour ago Malice Vidrine 5,674

0

votes

0

answers

14

views

Simplicial induced map $\sigma_*$

homotopy-theory simplicial-stuff simplicial-complex

modified 1 hour ago Alex Francisco 18.4k

0

votes

0

answers

20

views

Continuous analog of the Poisson R.V.

statistics poisson-distribution poisson-process

modified 1 hour ago Alex Francisco 18.4k

0

votes

0

answers

10

views

Probability of getting one of a pair in a sample

probability

asked 1 hour ago user8654291 1

-1

votes

0

answers

15

views

Help with lottery probability homework

probability statistics

modified 1 hour ago Phil H 3,125

0

votes

0

answers

16

views

How to figure out who made the mistake

probability bayes-theorem

asked 1 hour ago H.Roper 1

2

votes

0

answers

27

views

How to integrate$\int_0^{t} xe^{i(ax^2)}J_0(bx)\,\mathrm dx$?

calculus integration

modified 1 hour ago ted930511 31

0

votes

0

answers

6

views

How to prove the bound for Relative Round Off error

numerical-methods floating-point machine-precision

asked 1 hour ago Batman Naruto 6

0

votes

0

answers

15

views

How to prove fl(x^k) definition

numerical-methods floating-point machine-precision

modified 1 hour ago Batman Naruto 6

0

votes

0

answers

19

views

A function on a domain $D$ has a primitive on $D$ but is not analytic on $D$?

complex-analysis

modified 1 hour ago Ezy 101

0

votes

0

answers

17

views

Term for line over some values in graph theory

graph-theory

asked 1 hour ago Temur Bakhriddinov 79

1

vote

0

answers

6

views

Find $P(\tau_a<\infty|X_0=x)$ given $dX_t = rdt+dW_t$ using PDE method

pde stochastic-calculus stopping-times

asked 1 hour ago Edward Wang 750

1

vote

1

answer

21

views

Centroid of the Region bounded by y=sqrt(x) and y=x/2

calculus

answered 1 hour ago Mohammad Riazi-Kermani 35.7k

0

votes

1

answer

10

views

Is this a geometric distribution

probability probability-theory probability-distributions

answered 1 hour ago Siong Thye Goh 88.2k

0

votes

1

answer

7

views

Confusion about normalised floating point number systems

number-systems

answered 1 hour ago David K 50.3k

1

vote

0

answers

13

views

What is the structure of the multiplicative group of the ring $\mathbb{Z}_{p^k } $?

abstract-algebra abelian-groups

asked 1 hour ago CTW 63

-1

votes

2

answers

33

views

Why are incircle and circumcircle of regular polygons concentric?

geometry

answered 1 hour ago David K 50.3k

0

votes

2

answers

21

views

Convergence of series and limit

sequences-and-series limits analysis convergence

answered 1 hour ago Zamarion 310

0

votes

0

answers

7

views

Calculating rotation for a pair of unit vectors given initial and final states

linear-algebra geometry vectors rotations

asked 1 hour ago Austin Griffith 1

0

votes

1

answer

12

views

What is the sum of all the numbers on the opposite faces of numbers obtained in three rows is?

dice

answered 1 hour ago WhiteCrow 28

0

votes

0

answers

5

views

Score function - QDA

probability probability-theory machine-learning

asked 1 hour ago Learner 8

-1

votes

0

answers

10

views

Nonlinear system ( Lyapunov Stability )

nonlinear-system

asked 1 hour ago Mike 1

0

votes

0

answers

8

views

Show that the internal dynamics is unstable

control-theory nonlinear-system

asked 1 hour ago Juda Rostub 120

4

votes

1

answer

82

views

+200

(Random Walk) Compute average relative number of consecutive cookies eaten from the right side of the gap

probability stochastic-processes random-walk density-function expected-value

modified 2 hours ago G Cab 15.9k

4

votes

1

answer

108

views

Which graph with an automorphism group isomorphic to the quaternion group $Q_8$ minimizes $|V|+3|E|$?

combinatorics graph-theory algebraic-graph-theory latin-square

modified 2 hours ago Travis 56.9k

3

votes

2

answers

35

views

A question about limits of algebraic functions

calculus limits

modified 2 hours ago Paramanand Singh 46.4k

1

vote

1

answer

12

views

How many ways to make change using specific amounts.

combinatorics integer-partitions

answered 2 hours ago Hans Engler 9,679

-1

votes

1

answer

19

views

Prove $S=aT$ for some $a\in F$

linear-algebra linear-transformations

answered 2 hours ago user10354138 3,360

0

votes

0

answers

8

views

For $F: I \to \mathcal C$, show that the limit of $h_{\mathcal C} \circ F$ exists in $Func(\mathcal C^{op}, Set)$ and is $Hom(-,\lim F)$

category-theory limits-colimits

asked 2 hours ago BlueRoses 871

1

vote

1

answer

46

views

Prove that the function $\varphi :\mathbb{Q}\rightarrow\mathbb{R}$ is continuous.

real-analysis

answered 2 hours ago rogerl 17k

0

votes

1

answer

23

views

Prove if the function is Riemann Integrable based on its upper and lower sums

analysis

modified 2 hours ago Debarghya 101

1

vote

0

answers

20

views

Fact regarding the product of Affine varities

algebraic-geometry affine-varieties

modified 2 hours ago I. Cavey 456

0

votes

0

answers

6

views

Is this limit related to the surface (hyper)area?

real-analysis vector-analysis geometric-measure-theory

asked 2 hours ago Nik Pronko 861

0

votes

0

answers

13

views

Maximum of beta distributions

statistics

asked 2 hours ago Jair Taylor 8,609

2

votes

1

answer

12

views

Are minimal neighborhoods in an Alexandrov topology path-connected?

general-topology connectedness path-connected

modified 2 hours ago Eric Wofsey 171k

0

votes

0

answers

12

views

A trigonometric polynomial is equal to the modulus squared of a complex polynomial.

complex-analysis

asked 2 hours ago Adel 420

2

votes

0

answers

11

views

What is the canonical divisor on the symmetric product of $C$?

algebraic-geometry

asked 2 hours ago zzy 2,125

0

votes

0

answers

16

views

Find a logical formula which is a tautology if and only if this relation is a function

logic propositional-calculus

modified 2 hours ago thehardyreader 128

0

votes

0

answers

9

views

Field Theory Phase Factor vs Anomaly

physics mathematical-physics low-dimensional-topology

modified 2 hours ago Bob 652

0

votes

1

answer

13

views

$A$ can be written as the sum of rank-one matrices, i.e $A = \sum _{i=1}^r \sigma_i u_i v_i^*$

numerical-methods

modified 2 hours ago Ryan Howe 2,157

0

votes

0

answers

4

views

Is possible the posterior conditional expected value of a random variable is dependent of the same random varible?

conditional-expectation bayesian

asked 2 hours ago Fbayes 1

1

vote

1

answer

31

views

Division on a real quadratic ring of integers.

ring-theory algorithms euclidean-algorithm

modified 2 hours ago Gerry Myerson 145k

0

votes

0

answers

10

views

Determining codewords, so that code is 2 error-detecting

discrete-mathematics coding-theory

asked 2 hours ago Java Newbie 50

0

votes

0

answers

12

views

Exponential distribution example

probability probability-theory exponential-distribution

asked 2 hours ago vyome1 1

0

votes

0

answers

11

views

Which harmonics can be used to reduce the amplitude of the fundamental waveform?

trigonometry harmonic-analysis

asked 2 hours ago Lerbi 83

0

votes

0

answers

7

views

wave equation(doppler effect)

pde wave-equation

asked 2 hours ago QD666 75

1

vote

1

answer

35

views

Probability of getting (n+1) consecutive heads before n consecutive heads seems to tend to 0.33. Why?

probability stochastic-processes markov-chains

modified 2 hours ago Rohit Pandey 910

0

votes

0

answers

9

views

What is the induced $G$-action on the localization $S^{-1} A$?

group-actions localization

asked 2 hours ago Joshua Ruiter 1,749

0

votes

0

answers

24

views

Can't understood how find basis in linear space

linear-algebra vector-spaces change-of-basis

asked 3 hours ago yyycukayze3razavvozynicki 1

0

votes

0

answers

21

views

Measure network division by summation of clusters

discrete-mathematics proof-verification graph-theory proof-writing network

modified 3 hours ago QuestJ 6

0

votes

2

answers

78

views

+50

Checking behavior of critical points other than 2 nd derivative test method

multivariable-calculus optimization

modified 3 hours ago phaedo 74

0

votes

0

answers

13

views

Real analytic potential

real-analysis potential-theory

asked 3 hours ago M. Rahmat 389

0

votes

0

answers

21

views

Three-Digit Square Containing Numbers 1-9

square-numbers

asked 3 hours ago Jolly 11

0

votes

0

answers

8

views

Find an example to show Greedy TSP algorithm is not a good approximation

approximation

asked 3 hours ago ztcnkdx 1

0

votes

0

answers

8

views

How many errors can the code detect and how many will it correct?

discrete-mathematics coding-theory

asked 3 hours ago Java Newbie 50

1

vote

2

answers

37

views

Markov Memoryless Property confusion with counterexample

markov-chains markov-process

answered 3 hours ago grand_chat 19k

0

votes

1

answer

16

views

Calculating the derivative of a function that comprises of two other functions, partial derivatives

calculus multivariable-calculus derivatives partial-derivative

modified 3 hours ago Bertrand Wittgenstein's Ghost 54

0

votes

0

answers

8

views

Find a Minimizer of Entropy

real-analysis probability probability-theory

asked 3 hours ago Foobaz John 19k

1

vote

0

answers

24

views

Absolute value of difference between expected values of two distributions and total variation

probability proof-verification inequality probability-distributions total-variation

modified 3 hours ago kamada kawaii 6

0

votes

0

answers

5

views

Global convergence of the BFGS method

numerical-optimization

modified 3 hours ago Bernard 114k

0

votes

0

answers

5

views

partial Autocorrelation in terms of matrix

correlation

asked 3 hours ago dato datuashvili 5,435

1

vote

1

answer

20

views

about direct sum of modules

linear-algebra commutative-algebra modules

answered 3 hours ago Ennar 13.5k

-2

votes

0

answers

19

views

MathCounts 2018 School Competition Target Round Question 8

contest-math

asked 4 hours ago Gary 1

0

votes

1

answer

18

views

Generating function for strings in {a,b,c}* in terms of block decompositions

combinatorics generating-functions combinatorics-on-words

answered 4 hours ago Nicholas Boyku 497

0

votes

1

answer

25

views

Add the evens and odds to get the entire space.

linear-algebra algebra-precalculus functions

modified 4 hours ago user606845 1

0

votes

0

answers

5

views

Rate of convergence of the steepest descent method on a general linear function

numerical-optimization

asked 4 hours ago Kat 1

0

votes

3

answers

26

views

Metric Space and Analysis: Prove that if $U$ is an open subset of $\mathbb R$ and $c\in U$, then $U\setminus\{c\}$ is disconnected

general-topology complex-analysis elementary-set-theory metric-spaces

answered 4 hours ago DeepSea 69.8k

2

votes

1

answer

23

views

Reconstructing a non-$\omega$-categorical countable structure from its automorphism group

logic model-theory automorphism-group

answered 4 hours ago Alex Kruckman 25k

0

votes

1

answer

29

views

Showing an isomorphism exists between either $\mathbb Z_4$ or $\mathbb Z_2 \times \mathbb Z_2$

abstract-algebra group-theory

answered 4 hours ago Ennar 13.5k

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