Mathematics Stack Exchange

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Is U and V the same for the horizontal component of a projectile?

classical-mechanics projectile-motion

asked 1 min ago Abu 9

0

votes

0

answers

4

views

Problem of Permutation and combination

combinatorics

asked 2 mins ago aman 1

1

vote

1

answer

10

views

Equidistribution theorem in two dimension

number-theory equidistribution

answered 2 mins ago Tuvasbien 3,350

2

votes

3

answers

44

views

$\langle x,y \rangle (\lVert x \rVert + \lVert y \rVert) \leq \lVert x \rVert \lVert y \rVert \lVert x+y \rVert$

real-analysis inner-product-space

modified 3 mins ago Angelo 2,003

0

votes

0

answers

3

views

Formally correct Set expression

elementary-set-theory

asked 3 mins ago Weenzeal 1

1

vote

1

answer

10

views

Are you allowed to rearrange terms on the same side of an equation if its subtraction

education

modified 3 mins ago Kartik Bhatia 136

0

votes

0

answers

5

views

Arc Ellipse tangent line

geometry computational-geometry

asked 4 mins ago Nate0804 1

0

votes

0

answers

3

views

would the extreme points of a convex set still be extreme in it's convex subset?

convex-analysis convex-hulls

asked 5 mins ago peng yu 485

0

votes

0

answers

6

views

How to determine a matrix given degenerate eigenvalues and eigenvectors?

eigenvalues-eigenvectors inverse singularity

asked 6 mins ago consideration 1

0

votes

0

answers

2

views

Proving row vectors of matrix product are linearly independent

linear-algebra vector-spaces

asked 6 mins ago heller1681 1

1

vote

1

answer

16

views

Distribution likelihood ratio given $P(LR \geq x \mid H_2)=\frac{1}{x}$

probability probability-distributions conditional-probability

answered 8 mins ago Michael Hardy 241k

4

votes

1

answer

65

views

Prove: “if three points are on a straight line, at least one point is between the other two.”

euclidean-geometry axiomatic-geometry

modified 8 mins ago Eric Wofsey 248k

0

votes

0

answers

5

views

Projectile on inclined plane using rotation matrices

matrices classical-mechanics

asked 9 mins ago Buraian 1,571

2

votes

2

answers

19

views

To find the number of Elements of order in Galois Field $GF(p^n)*$,

finite-fields cyclic-groups galois-extensions

modified 9 mins ago Chris Custer 33.4k

0

votes

1

answer

13

views

The standart inner product for $f(x,t),g(x,t) \in L^2([a,b]\times[c,d])$

inner-product-space

answered 1 min ago user798202 541

1

vote

3

answers

19

views

Cartesian product set notation

discrete-mathematics elementary-set-theory

modified 12 mins ago Jamāl 352

1

vote

0

answers

17

views

Numerically solve an integral equation of the form $f(x)=f(0) - \frac{1}{2} \int_0^x f(x-y) \cdot (1-H(y)^2)\, dy.$

real-analysis calculus numerical-methods integral-equations numerical-calculus

modified 12 mins ago Darkwizie 727

1

vote

0

answers

16

views

Difference between two Positive Definite Matrices

eigenvalues-eigenvectors positive-definite positive-semidefinite

modified 16 mins ago Servaes 45k

0

votes

0

answers

20

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Complex sequence $\forall n\in\mathbb{N},\,u_{n+1}=f(u_n)$ with $p$ limit points

sequences-and-series complex-analysis limits

modified 16 mins ago Marcin 37

-2

votes

0

answers

20

views

Show that P is invertible

linear-algebra

modified 17 mins ago Aryadeva 26k

1

vote

1

answer

21

views

How to calculate sum of these vectors?

vectors

answered 18 mins ago Aqua 74.9k

0

votes

1

answer

11

views

There exists points in closure of set whose distance is diameter of set

real-analysis analysis solution-verification

modified 20 mins ago viru 1,241

0

votes

2

answers

15

views

Intution for integral of sine function

trigonometric-integrals

answered 20 mins ago user2661923 2,124

0

votes

0

answers

19

views

$\lim_{h\rightarrow0^+} \frac{1}{h^2} [\frac{f(v+hu)+ f(v-hu)}{2} - f(v)]$

limits multivariable-calculus derivatives vectors vector-analysis

modified 21 mins ago 0-th User 6,230

0

votes

1

answer

37

views

Poisson kernel approaches Dirac delta proof

harmonic-functions dirac-delta

modified 22 mins ago David C. Ullrich 76.1k

0

votes

1

answer

22

views

Condition for all even numbers to be prime

logic prime-numbers propositional-calculus

modified 23 mins ago Shaun 24.5k

2

votes

0

answers

61

views

Variance of $\log ( \exp(A) + \exp(B) )$

probability

modified 24 mins ago user3389118 31

1

vote

3

answers

37

views

Smooth function of infinitely many variables

real-analysis derivatives smooth-functions frechet-derivative

modified 25 mins ago Tobias Fritz 135

0

votes

1

answer

17

views

Discuss limit at all point in $\mathbb R^2$ for function given by $f(x,y) = x \sin(\frac{1}{y})$ , $y$ not equal to $0$.$f(x,y) = 0,y = 0$

calculus limits multivariable-calculus

modified 26 mins ago Gio 1,248

0

votes

0

answers

18

views

+150

Best Linear Solvers for Random Matrices

linear-algebra reference-request numerical-linear-algebra random-matrices

modified 27 mins ago Hyperplane 7,039

6

votes

1

answer

90

views

+100

Recurrence relation between two series

real-analysis sequences-and-series

answered 28 mins ago K.defaoite 3,264

0

votes

0

answers

15

views

Find alpha beta such that $S$ is convex

convex-analysis

modified 30 mins ago Aryadeva 26k

0

votes

0

answers

15

views

Does this linear equation system have a solution?

linear-algebra probability-distributions

modified 30 mins ago sai-kartik 2,005

2

votes

1

answer

19

views

Is there an involutive automorphism mapping two given elements of a poset or lattice?

combinatorics order-theory lattice-orders automorphism-group involutions

modified 30 mins ago Servaes 45k

0

votes

0

answers

16

views

Certificate of optimality from a bound on the dual norm

convex-optimization

modified 31 mins ago MONODA43 513

0

votes

0

answers

6

views

Difficulty with: If $P,Q \in \mathcal{L}(H)$ and $0 \leq P \leq Q \implies ||P|| \leq ||Q||$

real-analysis inequality partial-differential-equations operator-theory

asked 32 mins ago user905942 1

-1

votes

0

answers

9

views

How can i demostrate that a sigma-algebra generatad by a collection of set is indeed a sigma algebra?

probability probability-theory

modified 36 mins ago Omar 1

0

votes

0

answers

26

views

+100

Predict the number of iterations of a stochastic process that solves a stochastic differential equation

stochastic-processes markov-chains markov-process stochastic-analysis stochastic-differential-equations

modified 38 mins ago Rodrigo de Azevedo 16.2k

0

votes

0

answers

19

views

What points can be constructed using two compasses?

geometry geometric-construction

asked 39 mins ago marty cohen 92.9k

3

votes

2

answers

22

views

Are these hyperplanes close to each other?

real-analysis functional-analysis

answered 39 mins ago Ruy 596

0

votes

1

answer

11

views

What to read after some of Hungerford?

abstract-algebra

answered 39 mins ago blank_space 11

0

votes

1

answer

20

views

topology of relative CW complex

algebraic-topology cw-complexes

answered 42 mins ago Paul Frost 32.7k

1

vote

0

answers

15

views

Is $\int f \,\mathrm{d}\nu$ Gaussian if $f$ is a Gaussian process and $\nu$ is a regular bounded finitely additive measure?

probability integration probability-theory stochastic-processes normal-distribution

modified 47 mins ago Michael Hardy 241k

0

votes

0

answers

5

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Prediction Of a Future Value of a Random Variable

probability probability-distributions random-variables problem-solving poisson-distribution

asked 48 mins ago TheeeFoxxx 23

0

votes

0

answers

9

views

How do I determine if a given curve gives us the reparametrization of another curve?

geometry differential-geometry algebraic-geometry differential-topology surfaces

asked 48 mins ago Akainu 31

-2

votes

0

answers

10

views

How to prove Markov subchain is also a Markov chain?

markov-chains machine-learning

modified 49 mins ago Ben Grossmann 170k

0

votes

1

answer

10

views

Necessary and Sufficient condition about the bounded function.

analysis

modified 51 mins ago Gio 1,248

1

vote

0

answers

9

views

Basics questions about holomorphic $1$-form defined on Riemann surface $X$, and action of a group $G$ over $X$

complex-analysis complex-geometry differential-forms riemann-surfaces

modified 52 mins ago ChocoSavour 879

1

vote

0

answers

12

views

The sum of the odd terms of partial combination numbers

combinatorics

asked 53 mins ago Kris Prokins 189

2

votes

1

answer

25

views

Norm and Trace of algebraic integer in extension field

field-theory algebraic-number-theory

answered 56 mins ago Servaes 45k

0

votes

0

answers

18

views

Question about the conformal map in the dirchlet problem(Stein and Shakarchi)

complex-analysis

modified 1 hour ago curious_analyst 99

0

votes

0

answers

8

views

Find a node minimizing the sum of shortest distances between a set of other nodes in a graph

graph-theory

modified 1 hour ago Kartik Bhatia 136

0

votes

1

answer

11

views

Problems in understanding of markov chains in context of coupling from the past

probability-theory discrete-mathematics markov-chains coupling

answered 1 hour ago harwiltz 196

0

votes

0

answers

8

views

Using the Weak Maximum Principle on a boundary value problem PDE

inequality partial-differential-equations heat-equation maximum-principle

asked 1 hour ago hitech physics 549

0

votes

1

answer

13

views

Set notation for conditional

general-topology discrete-mathematics set-theory order-theory

modified 1 hour ago Air Mike 2,060

3

votes

1

answer

26

views

How is the notation $f \times A$ used?

category-theory notation

modified 1 hour ago varkor 1,579

3

votes

1

answer

17

views

Finding a compact set contained in a measurable set

measure-theory lebesgue-measure measurable-sets

modified 1 hour ago MathQED 11.2k

0

votes

0

answers

12

views

The Dinitz problem - question about the proof

graph-theory

modified 1 hour ago bof 62.4k

-1

votes

1

answer

14

views

Contractive Sequences

real-analysis calculus sequences-and-series

answered 1 hour ago Raffaele 14.6k

3

votes

0

answers

33

views

Why is the domain of a parametrised curve given by an open interval?

differential-geometry differential-topology curves parametrization

modified 1 hour ago Arctic Char 4,922

1

vote

2

answers

26

views

Checking if a set is a vector space

linear-algebra vector-spaces

modified 1 hour ago Calvin Khor 23.2k

5

votes

0

answers

28

views

How can we prove the geometric equality $S^2−S(a+b+c+d+e)+ab+bc+cd+de+ea=0$?

geometry triangles area

modified 1 hour ago Edwards 191

28

votes

5

answers

6k

views

probablity of random pick up three points inside a regular triangle which form a triangle and contain the center

probability triangles geometric-probability

modified 1 hour ago ishwar b b 37

0

votes

0

answers

16

views

Can all (inverse) trigonometric functions with periodic iterates be characterized?

real-analysis functions trigonometry reference-request periodic-functions

modified 1 hour ago Max Muller 4,209

1

vote

2

answers

25

views

For every vector $w \in \mathbb{R}^3$, $Aw$ is in the span of $u$. Prove this.

linear-algebra matrices vectors

answered 1 hour ago Chris Custer 33.4k

-1

votes

0

answers

9

views

Which definition for the regular Pumping Lemma is correct or more precise?

definition computer-science formal-languages regular-language pumping-lemma

asked 1 hour ago Doesbaddel 1,093

0

votes

0

answers

7

views

Dual space of the space of matrix-valued, continuous functions on a locally-compact, Hausdorff space vanishing at infinity.

functional-analysis measure-theory operator-algebras

asked 1 hour ago Ittiolo 777

0

votes

0

answers

17

views

least squares and orthogonal projection

linear-algebra orthogonality least-squares

modified 1 hour ago Patrícia 1

4

votes

2

answers

37

views

Consider the Lie Algebra $L=(\mathbb{R}^3,\times)$. Show $\nexists x \in L$ s.t. $ad(x)$ is diagonalisable

linear-algebra abstract-algebra vector-spaces lie-algebras

answered 1 hour ago Andreas Cap 13.9k

2

votes

1

answer

15

views

Help with conceptual vector and matrix related questions.

matrices vectors

modified 1 hour ago Servaes 45k

0

votes

0

answers

6

views

Normal sheaf of a nonsingular subvariety

algebraic-geometry divisors-algebraic-geometry

asked 1 hour ago Ominusone 180

0

votes

0

answers

9

views

Confusion about homogeneous spaces associated to a cocycle $\xi$ and its localization $\xi_v$.

abstract-algebra algebraic-geometry homology-cohomology elliptic-curves homogeneous-spaces

asked 1 hour ago eatfood 1,414

0

votes

0

answers

6

views

Understanding the sensitivity of the parameter for measurement

statistics mathematical-physics

asked 1 hour ago Surya 1

1

vote

1

answer

16

views

An assumption based on a matrix theorem

linear-algebra matrices eigenvalues-eigenvectors transformation

modified 1 hour ago Ben Grossmann 170k

4

votes

1

answer

70

views

Generating (almost?) all odd numbers for the 3n + 1 problem

sequences-and-series solution-verification recreational-mathematics collatz-conjecture

modified 1 hour ago Roy van Rijn 167

0

votes

0

answers

14

views

cummulative distribution function of random variables

probability probability-theory probability-distributions

asked 2 hours ago mathbeginner 439

0

votes

0

answers

11

views

On the image of a rational point of a scheme (Q.liu exercise 3.7)

algebraic-geometry schemes

asked 2 hours ago Yassine Elkaouni 327

0

votes

0

answers

13

views

Adjoint Property of a matrix

matrices

modified 2 hours ago Bernard 155k

1

vote

1

answer

18

views

How do I find a way to write a a vector as a linear combination of other vectors 3 different ways?

matrices matrix-calculus

answered 2 hours ago Äres 4,077

1

vote

0

answers

10

views

Check whether a graph is fractionally k-colorable

graph-theory coloring learning

modified 2 hours ago Niklas R. 1,824

2

votes

1

answer

22

views

Prove that any map $f : X \to Y$ can be represented as composition of 1) inj and surj. 2) surj. and inj.

functions elementary-set-theory solution-verification function-and-relation-composition

answered 2 hours ago Henno Brandsma 177k

1

vote

0

answers

14

views

Probability of randomly selecting a number in the set ${2^n}$ from positive natural numbers?

probability statistics logarithms approximation

asked 2 hours ago UNOwen 11

0

votes

0

answers

13

views

How to prove this problem about lebesgue measure?

lebesgue-measure

asked 2 hours ago user793548 1

1

vote

0

answers

10

views

Does $(\operatorname{div}fX)(a)=\langle\nabla f(a),X(a)\rangle+f(a)(\text{div}X)(a)$ hold for a scalar field $f$ and vector field $M$ on a manifold?

differential-geometry smooth-manifolds divergence-operator manifolds-with-boundary submanifold

modified 2 hours ago 0xbadf00d 10.5k

0

votes

0

answers

25

views

Linear maps - injective but not surjective

vector-spaces linear-transformations

asked 2 hours ago Luiza Rodrigues 1

0

votes

0

answers

9

views

Show that the solution of the differential equation $x'(t) = f(x(t))$ with the initial condition $x(0)=x_0$ is unambigous if f is Lischitzcontinous

ordinary-differential-equations proof-writing lipschitz-functions initial-value-problems

asked 2 hours ago kpopgirl 13

0

votes

0

answers

5

views

Find a map the yields a specific vector field

differential-geometry

modified 2 hours ago 0-th User 6,230

1

vote

3

answers

16

views

Dimension of Hilbert space tensor product

abstract-algebra functional-analysis hilbert-spaces tensor-products orthogonality

answered 2 hours ago JustDroppedIn 6,661

11

votes

0

answers

94

views

Are $3^6-6^3$ and $4^8-8^4$ the only sums of four $a^b-b^a,1\lt a\lt b$ numbers?

number-theory elementary-number-theory reference-request examples-counterexamples recreational-mathematics

modified 3 hours ago Vepir 10k

-1

votes

0

answers

21

views

basis for $A \times B$ were $A$ and $B$ are vector space with basis

linear-algebra vector-spaces

modified 3 hours ago raghu 11

1

vote

0

answers

15

views

If $f(x)-\nabla f(x)^Tx$ is bounded for all $x\in\mathbb{R}^n$, then is f(x) approximately affine?

real-analysis multivariable-calculus

modified 3 hours ago Arctic Char 4,922

2

votes

0

answers

20

views

Maximize functional with dot product in it

calculus derivatives calculus-of-variations functional-calculus

modified 3 hours ago zimmerrol 121

0

votes

3

answers

22

views

Integrating a trigonometric polynomial by changing variable

integration trigonometry trigonometric-integrals change-of-variable

answered 1 min ago Michael Hoppe 14.4k

0

votes

1

answer

22

views

Associate number with leading zeros with one without

decimal-expansion natural-numbers

modified 3 hours ago J.-E. Pin 27.7k

2

votes

0

answers

13

views

Divergence of a smooth map $M\to\mathbb R^d$ on a submanifold $M$ of $\mathbb R^d$ with boundary

differential-geometry smooth-manifolds divergence-operator manifolds-with-boundary submanifold

modified 3 hours ago 0xbadf00d 10.5k

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