Mathematics Stack Exchange

3

votes

0

answers

26

views

Iterated arithmetic derivative

number-theory arithmetic-derivative

modified 2 mins ago Mane.andrea 26

0

votes

0

answers

2

views

Number of compositions of a positive number n, with factors between 1 and a certain number m

combinatorics

asked 2 mins ago Gabriele Picco 20

3

votes

4

answers

35

views

Number of moves required to empty all the boxes as per the given rules

combinatorial-game-theory

modified 2 mins ago fantasie 157

0

votes

0

answers

11

views

Find the limit of the function if it exists

calculus limits derivatives

modified 2 mins ago gimusi 92.5k

-1

votes

1

answer

8

views

Prove conditions for upper triangular matrix

linear-algebra eigenvalues-eigenvectors

answered 3 mins ago Tsemo Aristide 55.2k

0

votes

0

answers

3

views

Linearly constrained quadratic programming

convex-optimization quadratic-forms constraint-programming

asked 4 mins ago Majid Mohammadi 22

0

votes

2

answers

17

views

Evaluation of infinite series summation

sequences-and-series

answered 5 mins ago Tolaso 3,357

0

votes

2

answers

982

views

Smart way to compute Residual Sum of Squares (RSS) in Multiple Linear Regression

linear-algebra regression

modified 6 mins ago Community♦ 1

0

votes

2

answers

12

views

Can I add the constant of integration when and wherever I want?

integration

modified 7 mins ago dor gotleyb 13

1

vote

2

answers

13

views

A.S. convergence of sum of square-integrable independent random variables with summable variation

real-analysis probability probability-theory convergence borel-cantelli-lemmas

modified 8 mins ago d.k.o. 8,417

0

votes

1

answer

12

views

In how many ways 11 items can be distributed among 3 peoples such that, sum of items received by any two is more than the third

combinatorics

answered 8 mins ago Oldboy 6,148

1

vote

1

answer

44

views

General solution vs General Integral

differential-equations pde

modified 9 mins ago JJacquelin 42.3k

1

vote

1

answer

15

views

$\int_{[0,1]} \int_{[0,1]} \frac {x^2-y^2}{(x^2+y^2)^2}dxdy$ and $\int_{[0,1]} \int_{[0,1]} \frac {x^2-y^2}{(x^2+y^2)^2}dydx$

calculus integration multivariable-calculus definite-integrals

modified 11 mins ago RRL 48.4k

0

votes

0

answers

4

views

Geometric description of degenerate constraints & removing then

linear-programming

asked 12 mins ago kreitz 1

3

votes

2

answers

25

views

Find a formula for $S(n,m)$

calculus combinatorics number-theory elementary-number-theory

answered 12 mins ago thesagniksaha 135

0

votes

0

answers

3

views

laminar matroid polytope

combinatorics matroids

asked 20 mins ago western12 1

-1

votes

1

answer

43

views

Constructing a new function $F(x)$ and apply Rolle's Theorem

analysis derivatives rolles-theorem

modified 22 mins ago weilam06 128

0

votes

1

answer

14

views

Derivatives of function when the function is defined differently for different values of x

real-analysis calculus functions derivatives definition

modified 24 mins ago Robert Z 92.2k

0

votes

1

answer

30

views

Doubt from Functions

calculus functions

answered 34 mins ago Ankita Gupta 16

6

votes

2

answers

2k

views

Relative entropy is non-negative

probability

modified 37 mins ago lerner 279

1

vote

0

answers

29

views

Seeking Methods to solve $\int_{0}^{\infty} \frac{e^{-x^n}}{x^n + 1}\:dx $

real-analysis integration definite-integrals gamma-function

asked 41 mins ago DavidG 1,182

1

vote

2

answers

14

views

Computing least square solution when eigenvalue and eigenvectors are known.

linear-algebra

modified 43 mins ago Damien 372

0

votes

0

answers

7

views

The Number of “Stacked” Lattice Paths Between Two Boundaries

combinatorics binomial-coefficients determinant

asked 50 mins ago Tri 194

0

votes

1

answer

13

views

Showing that $P(a<X_1\leq b,c<X_2\leq d)=F(b,d)+F(a,c)-F(a,d)-F(b,c)$

probability random-variables density-function

modified 54 mins ago Henno Brandsma 103k

0

votes

2

answers

19

views

Completeness of a metric on measurable functions into a complete separable metric space

real-analysis probability-theory self-learning

modified 58 mins ago Guacho Perez 3,697

1

vote

1

answer

20

views

Question for proving something is bounded on an interval

real-analysis

answered 1 hour ago D.B. 718

3

votes

2

answers

34

views

Evaluate:$\frac{1}{2^{101}}\sum_{k=1}^{51} \sum_{r=0}^{k-1}\binom{51}{k}\binom{50}{r}$

binomial-coefficients binomial-theorem binomial-distribution

answered 1 hour ago Jacky Chong 17.4k

2

votes

2

answers

985

views

tangent space as kernel of map

differential-geometry differential-topology smooth-manifolds

modified 1 hour ago Community♦ 1

1

vote

0

answers

34

views

Solving 2nd order ODE with variable coefficients

differential-equations numerical-methods numerical-optimization wavelets

modified 1 hour ago HD239 442

0

votes

2

answers

43

views

Probability/Combinatorics problem regarding seating at multiple tables with men and women

probability combinatorics

modified 1 hour ago Richard Ambler 1,039

0

votes

1

answer

15

views

Dimensions of an algebraic expression

integration

modified 1 hour ago Robert Z 92.2k

0

votes

1

answer

11

views

Give an example of bounded linear functional

measure-theory examples-counterexamples

answered 1 hour ago D.B. 718

0

votes

1

answer

15

views

Finding a function of two variables satisfying some condtions

real-analysis functional-analysis numerical-methods

answered 1 hour ago Fred 43.6k

1

vote

1

answer

2k

views

Proving a set is a field

finite-fields

answered 1 hour ago Aditrix 1

2

votes

1

answer

45

views

Homology groups with different complexes

algebraic-topology homology-cohomology cw-complexes simplicial-complex

modified 1 hour ago Eric Wofsey 177k

2

votes

1

answer

21

views

Gamblers ruin difference equation says he'll never reach goal if $p=\frac 1 2$

probability sequences-and-series markov-chains

modified 1 hour ago Rohit Pandey 996

2

votes

1

answer

36

views

Proving $\pi_1(X\vee Y, p) = \pi_1(X,p) * \pi_1(Y,p)$

algebraic-topology

modified 1 hour ago Guido A. 7,061

0

votes

0

answers

34

views

+50

Identifying the Plane at Infinity in the World Necessitates Determining the Affine Geometry of the World?

geometry projective-geometry projective-space affine-geometry computer-vision

modified 1 hour ago The Pointer 2,560

0

votes

0

answers

7

views

When is a quasifinite surjective flat morphism also finite?

algebraic-geometry schemes affine-schemes flatness

asked 1 hour ago Ashvin Swaminathan 1,521

0

votes

0

answers

10

views

An simple intermediate step of the proof that $\partial^2 = 0$ in the case of singular homology

algebraic-topology proof-explanation

modified 1 hour ago Guido A. 7,061

0

votes

0

answers

33

views

$\int_{0}^{\infty} \frac{1}{1 + x^n}\:dx = \frac{1}{n}\Gamma\left( \frac{n - 1}{n}\right)\Gamma\left( \frac{1}{n}\right)$

real-analysis integration definite-integrals big-list

modified 1 hour ago DavidG 1,182

0

votes

0

answers

5

views

Coset space and orbit space of group action

algebraic-topology finite-groups group-actions

asked 1 hour ago piotrmizerka 339

0

votes

0

answers

23

views

To Find a 'Weight' Function on $\{(x, y)\in \mathbb{R}^2:\, x,y \geq 0\}$ Measuring A-Priori-Given Properties

real-analysis

modified 1 hour ago AmbretteOrrisey 511

0

votes

0

answers

9

views

Residence times of the telegraph process?

stochastic-processes markov-process random-walk

modified 1 hour ago kevinkayaks 135

1

vote

0

answers

17

views

Discrete mathematics: Question about finite automata

discrete-mathematics

modified 1 hour ago user302797 19.7k

0

votes

0

answers

9

views

Analytical function wrt to another function.

complex-analysis

asked 1 hour ago Piyush Divyanakar 3,329

0

votes

0

answers

18

views

Show that $f(x)-P(x)=\dfrac{x^4-1}{4!}f^{4}(c) $

real-analysis functions derivatives polynomials

modified 1 hour ago Join_PhD 110

2

votes

1

answer

26

views

How to derive the closed form of this gamma quotient?

algebraic-number-theory special-functions gamma-function

modified 1 hour ago pisco 11.4k

0

votes

1

answer

33

views

Lower bound for the function $h(x)=(1+1/x)\log(1+x)-1$ for $x > 0$.

real-analysis inequality

modified 1 hour ago Michael Rozenberg 94.9k

0

votes

1

answer

42

views

Advice for someone who loves math but doesnt like the academia side of it.

recreational-mathematics education

answered 1 hour ago StuartMN 1,406

0

votes

0

answers

9

views

Find a wave function with the given zeros

calculus functions trigonometry roots

asked 1 hour ago jippyjoe4 422

0

votes

0

answers

17

views

The error of a Taylor polynomial (relativistic kinetic energy)

real-analysis taylor-expansion

modified 2 hours ago Moo 5,496

1

vote

0

answers

34

views

Where does integral concept come from?

calculus integration definite-integrals

modified 2 hours ago Eric Wofsey 177k

0

votes

1

answer

28

views

What is an algorithm for enumerating all isomorphic subgraphs to a given input graph?

discrete-mathematics graph-theory algorithms computer-science graph-isomorphism

answered 2 hours ago Roll up and smoke Adjoint 8,923

0

votes

1

answer

35

views

$\sum_{k=0}^i \binom{n-i}{w-k}\binom{i}{k}(\frac{1}{3})^{k}$ closed form

combinatorics summation binomial-coefficients closed-form

modified 2 hours ago Eric Wofsey 177k

4

votes

2

answers

1k

views

Calculate Angle between Two Intersecting Line Segments

trigonometry

modified 2 hours ago Community♦ 1

0

votes

0

answers

14

views

Poincare Proof of Fundamental Theorem of Finitely Generated Abelian Groups

abstract-algebra reference-request

asked 2 hours ago Cade Reinberger 145

0

votes

2

answers

31

views

AIME I 2008 #13 solution?

algebra-precalculus

modified 2 hours ago trancelocation 8,895

3

votes

0

answers

51

views

+50

Closed form of an improper integral to solve the period of a dynamical system

integration improper-integrals special-functions lambert-w elliptic-integrals

modified 2 hours ago Shengkai Li 104

1

vote

1

answer

13

views

Markov Chain Construction

probability markov-chains

modified 2 hours ago symchdmath 43

3

votes

1

answer

82

views

Solve $2y''+y'=0$ using power series

differential-equations power-series

modified 2 hours ago Fourth 41

0

votes

0

answers

13

views

k non-attacking rooks on a chessboard with forbidden positions

combinatorics polynomials

asked 2 hours ago user3203476 684

-1

votes

2

answers

8

views

Find combination given expectation and variance

probability discrete-mathematics probability-distributions variance expected-value

answered 2 hours ago angryavian 38k

0

votes

0

answers

16

views

Solutions to the heat equation with a ring of coolant

differential-equations pde mathematical-modeling

asked 2 hours ago Demetri Pananos 1,177

4

votes

1

answer

37

views

About the definition of coinduction of a module

abstract-algebra modules representation-theory definition

modified 2 hours ago Pavel Čoupek 4,376

1

vote

1

answer

41

views

How to solve and ODE to find its solution

differential-equations proof-explanation

answered 2 hours ago ht1204 19

0

votes

0

answers

12

views

Range of Compositions of Functions

algebra-precalculus functions

modified 2 hours ago Agastya Rao 1

0

votes

0

answers

11

views

Expectation of the time that a person takes to be in every taxi in town

probability

asked 2 hours ago Jimmy Sabater 1,851

0

votes

1

answer

17

views

$\lVert f \rVert _{H^{s}(\mathbb{R}^d )} \leq C \lVert f \rVert_{L^{1} (\mathbb{R}^d )}$ cannot hold at $ s= -d/2$.

analysis fourier-analysis fourier-transform harmonic-analysis

answered 2 hours ago Jacky Chong 17.4k

1

vote

1

answer

14

views

How to calculate the average number of points randomly distributed within a time interval that are t + dt apart from one another?

probability statistics

answered 2 hours ago Ross Millikan 290k

-1

votes

0

answers

25

views

Question regarding groups of order $p^2q$

abstract-algebra group-theory finite-groups

modified 2 hours ago user10354138 6,965

0

votes

1

answer

12

views

Is there integer functions $f(n), g(n)$, such that $\lim_{n \to \infty} f(n)\zeta(2) + g(n) = 0$

number-theory

modified 2 hours ago Carl Schildkraut 11k

3

votes

1

answer

32

views

If $f(x) \geq g(x)\ \forall x \in [0,1]$, prove that $\int_0^1 f \geq \int_0^1 g$

real-analysis integration functions proof-verification riemann-integration

answered 2 hours ago Trevor Gunn 14.1k

0

votes

0

answers

21

views

Need help figuring out how to use this equation

trigonometry logarithms

asked 3 hours ago Nick Brown 1

0

votes

0

answers

13

views

Finding probability density of a sum of r.v

probability

asked 3 hours ago Jimmy Sabater 1,851

0

votes

1

answer

25

views

Confusion on multivariable partial differentiation from textbook

multivariable-calculus partial-derivative chain-rule

answered 3 hours ago saulspatz 13.7k

2

votes

1

answer

17

views

Distribution of torsion subgroups of elliptic curve

elliptic-curves

answered 3 hours ago Brandon Carter 7,178

0

votes

0

answers

23

views

Hitting time distribution with exponential growth

brownian-motion stopping-times

modified 3 hours ago J.Doe 1

0

votes

0

answers

4

views

Linear regression model with 2 categorical variables

statistics regression linear-regression

asked 3 hours ago mjab 24

1

vote

0

answers

32

views

How many endomorphisms $(\mathbb{N},\times)$ has? Like object in Mon category

abstract-algebra category-theory monoid

modified 3 hours ago Arsenii 124

0

votes

1

answer

18

views

Big O confusion about upper bound of an algorithm

asymptotics

modified 4 hours ago Ross Millikan 290k

0

votes

0

answers

21

views

Why there are rarely any further discussion on Boolean lattice in topology and algebra?

general-topology boolean-algebra

modified 4 hours ago William Sun 435

1

vote

0

answers

14

views

Is there a way to present all possible combinations for a given sequence on a grid-like space?

graph-theory

asked 4 hours ago fherder 6

0

votes

2

answers

25

views

Is classification by a semidirect product complete?

abstract-algebra group-theory finite-groups

modified 4 hours ago Michael Burr 26.5k

2

votes

2

answers

21

views

need help understanding a continuity proof

real-analysis continuity proof-explanation

modified 4 hours ago Gaby Alfonso 670

1

vote

1

answer

20

views

Nontrivial second order parallel symmetric tensor field on a general Riemannian manifold？

differential-geometry

modified 4 hours ago Travis 59.2k

0

votes

1

answer

26

views

Proof that pointwise convergence can disrupt convergence

real-analysis analysis pointwise-convergence

answered 4 hours ago Guacho Perez 3,697

0

votes

0

answers

46

views

How is $f(x)=x^p$ continuous for any real $p$?

real-analysis continuity logarithms

asked 5 hours ago Silent 2,644

0

votes

1

answer

22

views

Equivalent formulation of $T_1$ condition.

general-topology

answered 5 hours ago Robert Thingum 729

0

votes

0

answers

5

views

method of long division based on 10s complement

arithmetic

asked 5 hours ago Gregory Nisbet 422

0

votes

2

answers

28

views

Numerical Function Fitting

algorithms

modified 6 hours ago agcala 11

2

votes

0

answers

21

views

Let $V$ be a subspace of $\mathbb{R}^4$, spanned by $v$ and $u$. Find a linear transformation whose kernel is $V$.

linear-algebra linear-transformations

modified 6 hours ago amWhy 191k

0

votes

2

answers

34

views

Proof by Contradiction to Prove Theorem that is not True

discrete-mathematics

modified 6 hours ago Stu 1,162

1

vote

0

answers

22

views

Showing a function is convex by looking at the hessian.

multivariable-calculus derivatives convex-analysis convex-optimization

asked 6 hours ago user395788 40

1

vote

1

answer

25

views

Complex jet structures

complex-analysis differential-geometry

answered 7 hours ago Balarka Sen 9,894

1

vote

1

answer

39

views

Fourier series of $\frac{1}{x}$

fourier-series

answered 7 hours ago AlexanderJ93 5,871

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