Mathematics Stack Exchange

0

votes

1

answer

11

views

Extrema of a functional

ordinary-differential-equations calculus-of-variations

answered 28 secs ago Lutz Lehmann 88.1k

0

votes

1

answer

16

views

Proving $\mathbb{P}(A\cap B\cap C^c) = \mathbb{P}(A\cap B) - \mathbb{P}(A\cap B\cap C)$

probability elementary-set-theory

modified 45 secs ago Arjuna196 628

1

vote

0

answers

12

views

Natural deduction proof (Fitch) - Alternative using disjunction exclusion

solution-verification alternative-proof natural-deduction

modified 1 min ago NootExp 41

0

votes

0

answers

9

views

Unsure if the way I calculated the Maximum Likelihood estimator is correct.

probability maximum-likelihood

modified 1 min ago WindBreeze 386

1

vote

1

answer

9

views

Reference for consistency strength of ZFC + AD$^{L(R)}$

reference-request set-theory large-cardinals

answered 2 mins ago Andrés E. Caicedo 71.6k

0

votes

0

answers

11

views

If r_=(x,y,z) and r=||r_|| is ∇·r=0?

vector-analysis

modified 2 mins ago butter chi 9

0

votes

1

answer

10

views

Construct a harmonic function satisfying given two conditions

real-analysis complex-analysis analysis harmonic-functions

modified 2 mins ago 0-th User 6,703

0

votes

1

answer

17

views

Group acting coprimely by automorphism

group-theory finite-groups group-actions

answered 2 mins ago Ravi Fernando 3,025

0

votes

0

answers

11

views

Convert a piecewise function to Heaviside function

calculus

modified 5 mins ago Snow Max 3

0

votes

0

answers

4

views

Invariant Manifolds of ODE

real-analysis general-topology ordinary-differential-equations dynamical-systems

modified 6 mins ago CyberX 59

0

votes

0

answers

2

views

Relation between symbolic computation and symbolic dynamics

soft-question symbolic-computation

asked 7 mins ago private ryan 33

1

vote

1

answer

28

views

Given a Circle with center at $(\sqrt2,0)$ we need to look for points on the circle with rational coordinates

circles parametric

modified 8 mins ago Elliot G 13.8k

2

votes

2

answers

19

views

Confusion with modeling a trigonometric function with phase shift

trigonometry

modified 8 mins ago Michael Hardy 241k

0

votes

0

answers

5

views

Magnitude of difference of two complex exponentials

functions complex-numbers vectors complex-integration

asked 9 mins ago Rico 1

5

votes

2

answers

203

views

Prove that all combinators must fulfill A x = x for some x, given that M x = x x and composability of any two combinators

logic computer-science recreational-mathematics combinatory-logic

answered 14 mins ago user830455 1

0

votes

0

answers

15

views

Let $a_n$ be a sequence s.t $\lim_{n\rightarrow\infty} a_nb_n=0$ $\forall b_n$ real sequence. Show $\exists n_0\in N$ s.t $n\geq n_0 \implies a_n = 0$

real-analysis sequences-and-series limits

modified 14 mins ago paulmuaddib 31

1

vote

1

answer

22

views

Complete graph coloring

graph-theory coloring

modified 15 mins ago Arjuna196 628

2

votes

0

answers

16

views

Minimum number of operations to make a positive integer 1

contest-math

modified 16 mins ago anonuser01 954

1

vote

0

answers

12

views

A graph coloring problem

graph-theory coloring

modified 18 mins ago Blincer 167

1

vote

0

answers

10

views

How to construct a bijection between all base 2 representation of real numbers and all possible permutation of a binary string

real-analysis

asked 19 mins ago Conrad G 109

0

votes

2

answers

10

views

Second differential of function

derivatives differential

answered 20 mins ago johnnyb 1,409

3

votes

0

answers

69

views

A problem about an unramified prime in a Galois extension.

abstract-algebra number-theory commutative-algebra algebraic-number-theory

modified 26 mins ago NeoTheComputer 100

0

votes

0

answers

12

views

Difference between canonical and normal matrices.

linear-algebra matrix-decomposition jordan-normal-form

modified 27 mins ago Angus Campbell 37

0

votes

1

answer

25

views

Why you can't integrate this as it appears in the solution? And why this value is 0?

integration derivatives definite-integrals eulers-number-e

answered 27 mins ago Yves Daoust 183k

-1

votes

0

answers

7

views

Writing a subset of $\mathbb{M}(2,2)$ as a plane in $\mathbb{M}(2,2)$.

linear-algebra matrices plane-geometry

modified 28 mins ago F. Zer 1,898

1

vote

0

answers

26

views

$\phi(x) = |x|$ for $x\in [-1,1]$ and $\phi(x+2)=\phi(x)$ for all $x\in \mathbb{R}$. Show $|\phi(t) - \phi(s)|\leq |t-s|$

real-analysis lipschitz-functions

modified 29 mins ago preferred_anon 14.6k

2

votes

1

answer

47

views

$T$ is self-adjoint on $L^2$ and $T^4$ is a compact operator, will $T$ be compact on $L^2?$

functional-analysis operator-theory hilbert-spaces compact-operators adjoint-operators

answered 33 mins ago Ruy 982

1

vote

1

answer

38

views

Projective fibration over a projective manifold

algebraic-geometry complex-geometry projective-geometry kahler-manifolds

answered 35 mins ago Michael Albanese 77.1k

7

votes

5

answers

241

views

Evaluate $\int\frac{1}{1+x^6} \,dx$

calculus integration indefinite-integrals

modified 35 mins ago Quanto 42.3k

0

votes

2

answers

11

views

Compactness And Boundedness Of Metric Spaces

real-analysis

answered 36 mins ago Ben Grossmann 170k

2

votes

0

answers

31

views

The domain of $f(x)=x^{m/n}$ compared to $f(x)=\sqrt[\frac{n}{m}]{x}$

calculus functions

modified 36 mins ago Physor 1,335

0

votes

0

answers

7

views

What property of the hypergeometric function is employed to relate it to Bessel functions in this limit?

real-analysis special-functions mathematical-physics bessel-functions hypergeometric-function

asked 36 mins ago user1620696 20.9k

0

votes

0

answers

13

views

Conditions of dimensions of matrix

linear-algebra matrices matrix-equations

modified 37 mins ago Martin N. 97

0

votes

0

answers

9

views

Measure versus mass

measure-theory

asked 37 mins ago STF 1,507

4

votes

1

answer

36

views

Restriction of local diffeomorphism to a neighbourhood of a submanifold is injective

general-topology differential-geometry algebraic-topology smooth-manifolds

answered 38 mins ago Kajelad 5,844

0

votes

0

answers

6

views

Does there exist a matrix game with more than three players?

reference-request game-theory combinatorial-game-theory algorithmic-game-theory

asked 39 mins ago Sanjay Gupta 173

3

votes

1

answer

28

views

What does it mean when the extension of scalars is free?

algebraic-geometry commutative-algebra modules

modified 39 mins ago Qiaochu Yuan 317k

0

votes

0

answers

4

views

Distribution of stochastic process vs finite dimensional distribution of stochastic process vs modification

probability-theory measure-theory stochastic-processes

asked 40 mins ago Joey Doey 133

1

vote

0

answers

8

views

Prove that no Hamilton circuit exists (Find number of cases)

hamiltonian-path

asked 40 mins ago TotomaLover2312 115

0

votes

0

answers

17

views

intermediate value theorem to show $|x-a_1|+…+|x-a_n|=\frac{n}{2}$

calculus

asked 41 mins ago Adamrk 77

1

vote

1

answer

15

views

Fréchet derivative, partial derivatives, Jacobian, changes of bases etc…

functional-analysis analysis

modified 42 mins ago zugzug 3,302

5

votes

2

answers

49

views

distance between any two interior points in a triangle less than largest side

euclidean-geometry

modified 42 mins ago Sarthak Rout 194

2

votes

1

answer

37

views

Closed form solution to a divergence condition

differential-geometry partial-differential-equations vector-analysis fluid-dynamics

answered 43 mins ago Funktorality 2,653

0

votes

0

answers

27

views

Describe a random variable with MGF $\frac{1}{2-M(t)}$ where $M(t)$ is the MGF of $X$

probability-theory moment-generating-functions

modified 43 mins ago StubbornAtom 12.1k

0

votes

0

answers

8

views

Equivalent definitions of the Lebesgue measure

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

asked 44 mins ago jonnywhite 1

0

votes

1

answer

7

views

Find values of the trigonometric functions of the angle (in standard position) whose terminal side passes through the given point. $(1,7)$

functions angle

modified 45 mins ago Lion Heart 955

1

vote

1

answer

32

views

“enlarged” form and Aut(Spin(8))

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

answered 46 mins ago annie marie heart 2,351

0

votes

0

answers

7

views

Describing all functions from a given relation?

elementary-set-theory

asked 47 mins ago Nick 149

1

vote

1

answer

13

views

Finding a bound on the norm of a matrix

linear-algebra matrices eigenvalues-eigenvectors norm trace

answered 49 mins ago levap 54k

1

vote

0

answers

15

views

Advance Linear Algebra Textbook Recommendations

linear-algebra optimization numerical-methods numerical-linear-algebra

modified 49 mins ago Ben Grossmann 170k

0

votes

0

answers

32

views

When is dual norm equal to norm of the adjoint?

linear-algebra linear-transformations inner-product-space adjoint-operators

modified 49 mins ago Yaroslav Bulatov 3,335

1

vote

1

answer

7

views

Question about moment generating function of multivariate normal variable

moment-generating-functions gaussian

answered 51 mins ago Michael Hardy 241k

0

votes

1

answer

16

views

Continuity of integrals in the product of weak topologies

general-topology measure-theory weak-topology

modified 52 mins ago WoolierThanThou 10k

0

votes

0

answers

19

views

Is the sequence always divergent

convergence-divergence

asked 53 mins ago user587389 649

0

votes

0

answers

18

views

Interpretation of expected value of a Geometric Distribution

probability

modified 55 mins ago Souza 518

0

votes

0

answers

7

views

Is Prediction the same as Compression?

compression

asked 57 mins ago Gonçalo Peres 龚燿禄 113

0

votes

0

answers

7

views

How to calculate the mean from raw Histogram data

statistics time-series

asked 59 mins ago Stamson 1

3

votes

2

answers

594

views

Real Analysis, Folland problem 1.4.20 Outer measures

real-analysis measure-theory

answered 59 mins ago Carlo Morpurgo 53

0

votes

0

answers

9

views

no of ways to pick k objects from n and put them in p available spots.

combinatorics permutations combinations

asked 1 hour ago Amzy 48

0

votes

0

answers

24

views

Probability of two out of three randomly chosen numbers in $[1, 20]$ being $1$ and $2$

probability combinatorics

modified 1 hour ago JCAA 11k

3

votes

1

answer

19

views

Describe $\mathcal{N}_{G(\mathbb{P}^1,\mathbb{P}^k)\mid G(\mathbb{P}^1,\mathbb{P}^n)}$

algebraic-geometry vector-bundles fiber-bundles grassmannian

answered 1 hour ago AG learner 3,045

0

votes

0

answers

25

views

Measurability of $\|f(\cdot)\|$, if $f$ is weak measurable

functional-analysis

modified 1 hour ago Duncan Idaho 26

0

votes

0

answers

9

views

Show that a metrizable Abelian topological group can be metrized by an invariant metric $d$.

general-topology metric-spaces topological-groups

modified 1 hour ago Junk Warrior 47

0

votes

0

answers

13

views

Chabauty-Fell topology determined by a basis of the original space?

general-topology elementary-set-theory

modified 1 hour ago Keen-ameteur 4,027

0

votes

0

answers

10

views

Semilattices with the blocker idempotence property.

combinatorics terminology linear-programming lattice-orders polyhedra

modified 1 hour ago Ethan 9,996

0

votes

0

answers

7

views

Trying to understand question about Queuing theory

data-analysis queueing-theory

asked 1 hour ago one_person 1

1

vote

1

answer

24

views

Application of IVT on the example of population of squirrels.

calculus

modified 1 hour ago José Carlos Santos 287k

4

votes

3

answers

113

views

+50

Stopping Probabilities for Random Walk with Drift

probability probability-theory stochastic-processes martingales random-walk

answered 1 hour ago Mike Earnest 37.9k

2

votes

0

answers

33

views

Payoff of a dice game

probability expected-value conditional-probability dice

modified 1 hour ago M Grande 60

0

votes

0

answers

11

views

An example of a non-coherent ring

commutative-algebra

asked 1 hour ago Laassila souhayl 440

0

votes

0

answers

18

views

Are $L_p$ spaces Asplund?

functional-analysis convex-analysis banach-spaces normed-spaces

asked 1 hour ago John D 1,589

-1

votes

0

answers

8

views

How to draw the Cayley Graph with custom generators in Maple software

math-software maple

asked 1 hour ago StAKmod 584

2

votes

0

answers

73

views

How do I prove 8(x)! + (2x-1)² where x is an integer greater than or equal to 3, is never a perfect square.

number-theory modular-arithmetic square-numbers

modified 1 hour ago Daenarys 17

0

votes

0

answers

7

views

Simplicial complex matrices

linear-algebra geometry graph-theory simplicial-complex

asked 1 hour ago Makogan 1,694

0

votes

0

answers

8

views

T/F Questions About Singular Value Decomposition

linear-algebra svd

asked 1 hour ago Anthony Chen 5

0

votes

0

answers

13

views

Graph coloring of complete graph

graph-theory coloring

modified 1 hour ago RobPratt 15.8k

1

vote

0

answers

12

views

What is $\lim_{n\to\infty}P\left(\sum^n_{i=1}X_i\ge\sum^n_{i=1}Y_i\right)?$

probability limits probability-theory probability-distributions law-of-large-numbers

modified 1 hour ago oooo 125

1

vote

0

answers

28

views

Publishing an IMO type inequality solution?

inequality

asked 1 hour ago Fabian 51

0

votes

0

answers

8

views

Cavalieri's Method of Indivisibles: How to prove the limit?

calculus sequences-and-series limits

asked 1 hour ago Andreas Mair 15

0

votes

0

answers

8

views

How can I calculate popularity of items based on the ratings, the number of views, their related fingerprints, and the related dates?

statistics bayesian

modified 1 hour ago Billybobbonnet 101

0

votes

0

answers

10

views

Projection of vector

vector-spaces vectors vector-analysis

modified 1 hour ago Streamline Astra 15

3

votes

1

answer

42

views

How to find $q,\beta$ such that $\nabla\cdot[\gamma\nabla u]=0\Leftrightarrow(-\Delta +q)v=0$ for some $v=\beta u $?

real-analysis functional-analysis partial-differential-equations inverse-problems

modified 1 hour ago Glitch 6,313

1

vote

0

answers

13

views

identify wrong value in a simple equation

linear-algebra interpolation

asked 1 hour ago Vikram Murthy 11

0

votes

0

answers

12

views

Find the minimum value using a Normal distribution?

probability normal-distribution

asked 2 hours ago shrewd.jude 1

0

votes

0

answers

12

views

Using blowups to desingularise curves - understanding a simple example

algebraic-geometry blowup projective-varieties

asked 2 hours ago Qwertiops 1,633

0

votes

0

answers

30

views

+50

convergence of measures bound on decreasing sets

measure-theory

modified 2 hours ago user593295 496

0

votes

0

answers

9

views

Inequalities for Subgaussian Random Variables

probability-theory

modified 2 hours ago LinearGuy 349

0

votes

0

answers

13

views

Computing $n$-th term Holonomic Sequence in $O(\log(n))$?

sequences-and-series elementary-number-theory discrete-mathematics

asked 2 hours ago J. Linne 2,168

0

votes

0

answers

12

views

Extended system of vectors

linear-algebra linear-programming change-of-basis

asked 2 hours ago Peter 155

0

votes

2

answers

19

views

Finding total curvature of $y=x^2,\,x\in[0,1]$

differential-geometry solution-verification

modified 2 hours ago Ernie060 4,741

3

votes

1

answer

102

views

Show that $\sum_{i=1}^{n}(i-1,n)[(i,n)=1] = \phi(n) \sigma_0(n)$

elementary-number-theory summation arithmetic arithmetic-functions

answered 2 hours ago Teresa Lisbon 53.5k

77

votes

6

answers

9k

views

If $a+b=1$ so $a^{4b^2}+b^{4a^2}\leq1$

calculus multivariable-calculus inequality exponential-function

modified 2 hours ago Erik Satie 3,050

3

votes

1

answer

19

views

Existence of a `Partial Weak Limit' in $L^1$

functional-analysis

answered 2 hours ago supinf 8,472

2

votes

0

answers

27

views

Applications of the Coarea Inequality (other than to coarea formula)

lipschitz-functions geometric-measure-theory hausdorff-measure

modified 2 hours ago Behnam Esmayli 3,336

0

votes

0

answers

6

views

How to prove direct limit is a module

modules

asked 2 hours ago Osteo 11

1

vote

1

answer

13

views

Linearly dependent vector fields that are not spanned by fewer (continuous) vector fields.

linear-algebra vector-fields

answered 2 hours ago gt6989b 47.9k

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