Mathematics Stack Exchange

1

vote

2

answers

8

views

Calculate series sum(turning bounds)?

sequences-and-series

modified 5 mins ago Gae. S. 1,814

2

votes

3

answers

23

views

If $f$ is differentiable at $a$, then $\lim_{x\rightarrow a}f(x)$ exists.

calculus analysis

modified 5 mins ago iqntt1s 23

0

votes

0

answers

11

views

Poincare says we are born geometric or arithmetic thinkers. Which was Grothendieck in your opinion, and why?

algebraic-geometry philosophy

modified 6 mins ago Justin Latson 6

1

vote

2

answers

49

views

How can $S_n=n$ for the series $S_n=\frac{1}{2}+\frac{3}{4}+\frac{7}{8}+\frac{15}{16}+\cdots$

sequences-and-series summation geometric-progressions

answered 7 mins ago farruhota 24.7k

0

votes

0

answers

7

views

Orthogonal projection is independent of the basis.

linear-algebra orthogonal-matrices

asked 9 mins ago Xiejiajia 13

1

vote

0

answers

43

views

Smart algorithm to list all combination-patterns.

probability algorithms combinations

modified 11 mins ago Blue Various 38

0

votes

1

answer

748

views

Derivation of the Safety Stock Formula on Wikipedia

probability proof-verification conditional-expectation mathematical-modeling

answered 13 mins ago Akshay Desai 1

0

votes

0

answers

20

views

Can you help me with this inequality? $|x-1| < |x-3|$

inequality absolute-value

asked 17 mins ago j.reyner 1

0

votes

0

answers

6

views

A companion matrix is similar to its transpose

linear-algebra matrices

asked 18 mins ago Beginner 4,522

-1

votes

2

answers

21

views

How does the limit of two variables use delta and epsilon?

limits

answered 18 mins ago Ryan Greyling 428

1

vote

1

answer

35

views

Can a number be partitioned into parts satisfying this condition?

elementary-number-theory integer-partitions decimal-expansion natural-numbers

modified 19 mins ago Allawonder 4,379

0

votes

1

answer

15

views

problem from real analysis

real-analysis sequences-and-series

answered 20 mins ago Kavi Rama Murthy 110k

0

votes

1

answer

13

views

How is $ds/d\theta =R_0/\cos^2\Psi$ derived?

polar-coordinates tensors general-relativity

answered 22 mins ago Ak19 5,326

33

votes

0

answers

608

views

+100

Limit associated with a recursion

probability sequences-and-series number-theory recreational-mathematics recursion

modified 22 mins ago Vincent Granville 532

1

vote

1

answer

46

views

Expressing $f(f(x))$ when $f(x)$ is a piecewise function

calculus functions

modified 27 mins ago Kai Kin Chan 6

0

votes

0

answers

6

views

Projecting an implicit system of equations into lower dimensions

projection

asked 28 mins ago Curious Iitian 1

1

vote

0

answers

12

views

Let $(a_n)$ be a strictly increasing sequence of positive integers such that: $a_2 = 2$, $a_{mn} = a_m a_n$ for m, n relatively prime.

sequences-and-series

asked 30 mins ago J.Doe 694

1

vote

1

answer

756

views

Divide and Conquer (recurrence relation problem)…

combinatorics recurrence-relations

modified 31 mins ago Community♦ 1

0

votes

1

answer

11

views

interpretation of the derivative with respect to time in the Ricci flow equation

ricci-flow

answered 34 mins ago Allawonder 4,379

0

votes

0

answers

24

views

The existence of symmetric matrix such $A=XBX$

matrices matrix-equations matrix-calculus symmetric-matrices

modified 36 mins ago Jef 23

1

vote

0

answers

17

views

Can I solve this equation using Linear Algebra theory than using any Newton's methods?

linear-algebra roots

modified 36 mins ago Rajesh Dachiraju 846

1

vote

0

answers

26

views

Solving $ \int \sqrt{1 + \tan(x)}\:dx$

integration indefinite-integrals trigonometric-integrals

asked 39 mins ago Kevin Nivek 539

1

vote

1

answer

30

views

The convergence of a product

probability-theory random-variables

answered 40 mins ago Kavi Rama Murthy 110k

0

votes

0

answers

9

views

Complete metric

differential-geometry riemannian-geometry

asked 42 mins ago STUDENT 159

0

votes

0

answers

9

views

Conjecture on Prime Numbers and Exponential Equipment

number-theory prime-numbers conjectures

asked 46 mins ago ALPHATRION 6

-1

votes

0

answers

4

views

solve the initial value problem by the laplace transform.

integration

asked 46 mins ago ON SU 1

3

votes

0

answers

35

views

A Goldbach “Goldfish”: mirror symmetry of a graph representing addition of certain of the primes.

elementary-number-theory graph-theory prime-numbers goldbachs-conjecture mirror-symmetry

modified 48 mins ago Shine On You Crazy Diamond 9,541

1

vote

2

answers

27

views

Expected number of draws until first ace

probability expected-value

answered 48 mins ago farruhota 24.7k

0

votes

1

answer

9

views

Convexity of logarithmic function with inner product and $\ell_1$-norm

vector-spaces convex-analysis convex-optimization hessian-matrix

answered 49 mins ago Kavi Rama Murthy 110k

0

votes

0

answers

5

views

The practical significance of the probability measure function for continuous random variables

elementary-probability

asked 50 mins ago hanugm 945

0

votes

0

answers

9

views

Smith Normal form of a matrix

linear-algebra matrices proof-verification smith-normal-form

asked 53 mins ago Beginner 4,522

0

votes

0

answers

28

views

variations calculus. how to compute some variations?

integration analysis derivatives metric-spaces calculus-of-variations

modified 57 mins ago Iuli 3,723

-1

votes

1

answer

19

views

A shopkeeper mixes two varieties of wheat in the ratio 3:7, which cost Rs 10 / kg and Rs. 15 per kg respectively.

arithmetic

modified 58 mins ago Quanto 1,989

0

votes

1

answer

12

views

show that $\frac{dw}{du} = \frac{u+w+1}{u-w+3}$ can be solved by means of the substitution $w-1 = y, u+2 = t$

ordinary-differential-equations

answered 1 hour ago Allawonder 4,379

0

votes

0

answers

7

views

Average distance from centroid of convex figure

geometry proof-verification alternative-proof convex-geometry

modified 1 hour ago dysonsfrog 375

1

vote

1

answer

27

views

Real analysis problem from sequences?

real-analysis sequences-and-series cauchy-sequences

answered 1 hour ago Kavi Rama Murthy 110k

1

vote

1

answer

24

views

Given infinitely many linear inequalities, can we find an algebraic equation for the boundary?

algebraic-geometry semialgebraic-geometry

answered 1 hour ago KReiser 12.1k

0

votes

1

answer

13

views

The limite of borel mesurable functions are borel mesurable

measure-theory

answered 1 hour ago астон вілла олоф мэллбэрг 41.6k

2

votes

2

answers

23

views

Closed form for a special series

sequences-and-series

modified 1 hour ago Parcly Taxel 51.6k

0

votes

0

answers

13

views

Continuous but not d-continuous?

general-topology

asked 1 hour ago blabla 501

1

vote

0

answers

22

views

Combinatorial applications of diamond lemma

combinatorics reference-request rewriting-systems

modified 1 hour ago richrow 849

2

votes

2

answers

18

views

Get Y and Z axes from X axis

vectors 3d coordinate-systems

answered 1 hour ago user2671755 1

1

vote

0

answers

25

views

Can this inverse Laplace transform be computed?

laplace-transform inverselaplace

modified 1 hour ago Jean-Claude Arbaut 16.4k

2

votes

1

answer

46

views

Details in May's proof that local fibrations are fibrations

algebraic-topology fibration

modified 1 hour ago Memes 11

1

vote

1

answer

34

views

Is it true $\underset{x\to\infty}{\text{lim}}\left(\vartheta_3\left(0,e^{-\frac{\pi}{x^2}}\right)-x\right)=0$?

number-theory elliptic-functions

answered 1 hour ago reuns 26.4k

1

vote

1

answer

14

views

Let $C$ be a code of distance $d$, set $t=\lfloor(d-1)/2\rfloor$, then $C$ is not a $(t+1)$-error correcting code

abstract-algebra group-theory coding-theory

answered 1 hour ago Jyrki Lahtonen 114k

2

votes

1

answer

1k

views

Get reduced costs from simplex tableau

linear-programming

modified 1 hour ago Community♦ 1

0

votes

0

answers

46

views

Regular submanifold is locally a regular level set?

general-topology differential-geometry manifolds differential-topology submanifold

modified 1 hour ago Selene Auckland 548

0

votes

0

answers

9

views

Proof for Ramanujan's Oblong magic square

magic-square

asked 1 hour ago Deepa Kapoor 1

0

votes

0

answers

22

views

$\mathbb{Q}[x,y]/(x^2+y^2)\cong \mathbb{Q}[y,yi]$?

abstract-algebra ring-theory commutative-algebra ideals

asked 1 hour ago user682705 197

0

votes

0

answers

12

views

Psedoinverse and Left Inverse

linear-algebra

asked 1 hour ago Leo 11

1

vote

1

answer

17

views

Continuation of the Riemann Prime Counting function

prime-numbers mobius-inversion

answered 1 hour ago reuns 26.4k

1

vote

0

answers

16

views

IMO problems with physics relation

soft-question

asked 1 hour ago Aurora Borealis 920

1

vote

0

answers

15

views

Is there a “Riemann-Stieltjes integral” for discrete 2D functions?

probability statistics discrete-mathematics probability-distributions discrete-calculus

modified 2 hours ago Semiclassical 11.2k

2

votes

3

answers

32

views

Proving that $\mathbb{R}_K$ is connected with the topology $\tau$

general-topology analysis

answered 2 hours ago Henno Brandsma 128k

0

votes

2

answers

25

views

Is it possible that a non-empty set has different collections of dense subsets under a (non-trivial) metric and under a (non-trivial) topology?

general-topology metric-spaces

answered 2 hours ago bof 54.7k

0

votes

0

answers

22

views

deducing matrix square root from inverse function theorem

multivariable-calculus inverse-function-theorem

modified 2 hours ago me10240 479

0

votes

0

answers

18

views

Verify the Solution of an Integration

calculus linear-algebra integration

asked 2 hours ago Frey 658

1

vote

1

answer

18

views

An inspector has been informed that a certain gambling casino uses a “fixed” deck of cards one quarter of the time in its blackjack games

probability binomial-distribution bayes-theorem

modified 2 hours ago Matthew Daly 2,268

0

votes

0

answers

16

views

What is the name for this kind of combination problem?

algorithms combinations

modified 2 hours ago nmasanta 3,461

1

vote

0

answers

7

views

Understanding how to factor the differential operator of $y'' = \left [ \partial^2_x \log f + [\partial_x(\log f)]^2 +h-h_1 \right ]y$

ordinary-differential-equations differential-operators

asked 2 hours ago hirotaFan 6

1

vote

1

answer

29

views

Chosing points so that $5$ tangents determine a conic

geometry conic-sections

modified 2 hours ago Blue 52.5k

2

votes

0

answers

12

views

simply-connected compact Lie group v.s. semi-simple Lie group

lie-groups lie-algebras compactness connectedness reductive-groups

asked 2 hours ago wonderich 2,433

0

votes

2

answers

25

views

How to solve inequality with two absolute values on both sides “Without squaring both sides”?

algebra-precalculus absolute-value

modified 2 hours ago Quanto 1,989

0

votes

0

answers

33

views

Polyamory Network problem

graph-theory network graph-connectivity

modified 2 hours ago William Elliot 10.9k

2

votes

0

answers

30

views

Solution of Cox Lasso dual optimization Problem

convex-optimization

modified 2 hours ago floodking 11

0

votes

0

answers

10

views

Verifying Pullback Identity for Symplectomorphism

manifolds differential-forms symplectic-geometry

asked 2 hours ago Mnifldz 7,451

0

votes

1

answer

28

views

$\psi:\text{spec}(R/J)\to\text{spec}(R)$ is the natural mapping. Prove that if $\psi(Z)$ is Zariski closed then $Z$ is Zariski closed

abstract-algebra maximal-and-prime-ideals

answered 2 hours ago Es.Ro 1,186

6

votes

2

answers

79

views

Where to go after “olympiad math”?

soft-question self-learning book-recommendation

modified 2 hours ago Matthew Daly 2,268

0

votes

1

answer

20

views

Laplace transform of convolution when upper limit is infinity

laplace-transform

modified 3 hours ago Semiclassical 11.2k

0

votes

0

answers

13

views

Understanding Lattice statements from Serre's Local Fields

abstract-algebra localization local-field

asked 3 hours ago PerelMan 984

0

votes

0

answers

12

views

Closures under different inner products and the injectivity

general-topology functional-analysis

asked 3 hours ago user2379888 273

3

votes

0

answers

38

views

Integral with respect to spectral measure

functional-analysis measure-theory spectral-theory unbounded-operators self-adjoint-operators

modified 3 hours ago user3342072 389

1

vote

1

answer

28

views

Exercise 6.5.11 (Velleman's How to Prove It)

induction relations

answered 3 hours ago Matthew Daly 2,268

0

votes

0

answers

7

views

Appraise the statement: “For the model 𝑦 = 𝛽0 + 𝛽1𝑥 + 𝑒, 𝛽1 reflects the causal effect of 𝑥 on 𝑦.”

self-learning regression linear-regression

asked 3 hours ago Ivan Lee 1

0

votes

1

answer

16

views

Domain of composition of function

real-analysis analysis

answered 3 hours ago Joe 150

1

vote

0

answers

16

views

Packing number of inverse image of a function

real-analysis geometry differential-geometry metric-spaces geometric-topology

modified 4 hours ago neverevernever 117

0

votes

1

answer

24

views

Does an algebraic closure of $F_p$ contain an element of infinite (multiplicative) order?

field-theory finite-fields extension-field roots-of-unity splitting-field

modified 4 hours ago Marcus Barão Camarão 98

5

votes

1

answer

112

views

“Intuitions” to produce a single average, between the infimum and supernum of $P$, in a countable subset of $[a,b]$?

group-theory finite-groups group-actions average amenability

modified 4 hours ago Zachary Hunter 1,114

6

votes

0

answers

87

views

Is $z=e^{\frac{1}{\log(x)}}$ a solution to a polynomial?

algebra-precalculus polynomials soft-question rational-numbers

modified 4 hours ago Ultradark 619

3

votes

2

answers

36

views

Closure operators

algebraic-topology lattice-orders

modified 4 hours ago David Contreras 16

0

votes

0

answers

8

views

“Steady-state” of Error function using Fourier Transform

fourier-analysis fourier-transform

asked 4 hours ago dleal 97

5

votes

0

answers

63

views

The kernel of $\mathbb{Q}[x,y]\rightarrow \mathbb{Q}(t)$ is $(x^2+y^2-1)$.

abstract-algebra proof-verification ring-theory commutative-algebra ideals

modified 4 hours ago user682705 197

1

vote

0

answers

23

views

Construction of the Tangent Bundle

algebraic-geometry reference-request tangent-spaces

asked 5 hours ago Dean Young 2,479

2

votes

4

answers

70

views

Find the remainder of $\frac{x^{2015}-x^{2014}}{(x-1)^3}$

polynomials

answered 5 hours ago lab bhattacharjee 236k

2

votes

0

answers

26

views

Does there always exist a random variable whose conditional distribution is a given distribution?

probability-theory probability-distributions conditional-probability

modified 5 hours ago Rubertos 5,959

0

votes

0

answers

8

views

Are Intrinsic Volumes defined for non-polyconvex, non-compact sets?

geometry differential-geometry convex-geometry

asked 5 hours ago MathTrain 792

1

vote

1

answer

1k

views

Find all possible paths in a Matrix

matrices algorithms recursive-algorithms

modified 5 hours ago Community♦ 1

0

votes

0

answers

21

views

Analysis of multi-vectors

vector-analysis clifford-algebras geometric-algebras

modified 5 hours ago Zhaohui Du 21

0

votes

0

answers

5

views

On some special 5-tuples in projective space $PG(3,2)$

combinatorics projective-space finite-geometry

modified 5 hours ago N. F. Taussig 48.6k

2

votes

0

answers

17

views

error estimation for the Fourier series of the fractional part of $x$

real-analysis fourier-analysis fourier-series

modified 5 hours ago No One 2,292

1

vote

1

answer

21

views

Classification of simplicial complexes without boundary

combinatorics general-topology algebraic-topology

answered 5 hours ago Jack Crawford 833

2

votes

0

answers

17

views

Relating changes in unit vectors on a surface to the surface curvature

differential-geometry

asked 6 hours ago EPH 33

1

vote

1

answer

60

views

Win with positive probability implies there exists a strategy to win for sure?

probability combinatorics logic game-theory

modified 6 hours ago saulspatz 23.2k

0

votes

2

answers

20

views

Why could this formula “dist(x, y) = sqrt(dot(x, x) - 2 * dot(x, y) + dot(y, y))” compute the euclidean distance of two matrices?

linear-algebra matrices

answered 6 hours ago vonbrand 20.8k

4

votes

1

answer

56

views

Monodromy of local system is well defined

differential-geometry algebraic-geometry algebraic-topology sheaf-theory

modified 8 hours ago Joshua Mundinger 3,351

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