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votes

0

answers

8

views

Fastest way to determine period of eventually periodic sequence?

sequences-and-series

asked 4 mins ago Yiannis Galidakis 3,316

0

votes

1

answer

18

views

Five pills problem from exercises based on Feynman's lectures

probability statistics summation recreational-mathematics problem-solving

answered 5 mins ago Brian M. Scott 522k

0

votes

0

answers

2

views

Uniform bound for derivatives of holomorphic function on compact set

complex-analysis derivatives upper-lower-bounds cauchy-integral-formula

asked 5 mins ago lizardknight 188

0

votes

0

answers

14

views

Natural Deduction Proof with Quantifiers Proof Validation

discrete-mathematics solution-verification propositional-calculus quantifiers natural-deduction

modified 5 mins ago M__ 368

0

votes

1

answer

21

views

How to compare likelihood of different distributions from data

statistics reference-request statistical-inference

answered 6 mins ago BruceET 41.7k

0

votes

0

answers

3

views

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

order-theory lattice-orders automorphism-group

asked 6 mins ago ycras 1

0

votes

0

answers

6

views

Show that a complex function is identically zero.

complex-analysis analytic-functions

asked 7 mins ago Shanna 13

0

votes

0

answers

7

views

What can be a generalization of repeats in exponentiation using modulo?

number-theory modular-arithmetic exponentiation

asked 7 mins ago Kartik Bhatia 93

0

votes

0

answers

3

views

Basic Interest Rate Question Regarding Settlement Dates

algebra-precalculus finance

asked 8 mins ago qp212223 756

0

votes

0

answers

6

views

Efficiently solving system of matrix equations

systems-of-equations linear-programming matrix-equations

asked 9 mins ago mtheorylord 4,193

0

votes

0

answers

7

views

Find $rad(A),rad^2(A)$ y $rad^3(A)$

abstract-algebra matrices ideals maximal-and-prime-ideals

asked 11 mins ago Sofía 21

0

votes

1

answer

51

views

+50

When can you factor out terms from a double integral?

integration multivariable-calculus multiple-integral

modified 12 mins ago Buraian 1,571

0

votes

0

answers

22

views

Defining a function as the integral of a differential one-form

multivariable-calculus differential-forms line-integrals

modified 14 mins ago Arctic Char 4,923

1

vote

2

answers

21

views

Show $\mu(E) = 2\lambda(E\cap[0,\infty))$, $\mu = \lambda \circ u^{-1}$ (image measure)

measure-theory

answered 15 mins ago Oliver Diaz 9,085

0

votes

0

answers

30

views

Why is the general case easier when proving that finite sets in general position may be described as the zero locus of quadratic polynomials?

algebraic-geometry projective-varieties

modified 17 mins ago KReiser 30.1k

-1

votes

1

answer

27

views

Interesting Limit Behavior of Surface?

calculus limits analysis multivariable-calculus

answered 20 mins ago Andrei 23.3k

0

votes

1

answer

7

views

Variance of conditional geometric random variable

probability probability-distributions expected-value variance

answered 22 mins ago sven svenson 438

0

votes

1

answer

11

views

How to write $A D A^T x$ as $\sum_{j=1}^p A_j D_{jj} A_j^T x$?

linear-algebra

answered 23 mins ago kub0x 1,989

0

votes

0

answers

15

views

How to compute sum of non-positive, non alternating series

sequences-and-series

asked 24 mins ago Dominic 351

0

votes

0

answers

26

views

Looking for a formula to find the number of possible variations in this sequence

sequences-and-series

modified 24 mins ago Edward Small 11

0

votes

0

answers

11

views

Infinite expectation & order statistics

statistics probability-distributions expected-value order-statistics

modified 25 mins ago bodhi 31

0

votes

1

answer

20

views

absolute value inequality equivalence

inequality

modified 25 mins ago Jean Marie 47.3k

0

votes

1

answer

21

views

Find the probability limit of sequences of random variables

probability probability-theory convergence-divergence

modified 26 mins ago angryavian 57.9k

0

votes

1

answer

13

views

How to make $x_3 x_4 x_5$ independent variables in this linear system of equation?

linear-algebra numerical-linear-algebra

answered 27 mins ago John Hughes 79.8k

0

votes

0

answers

5

views

Constructing the enveloping $C^$-algebra w.r.t. a $C^$-seminorm.

functional-analysis c-star-algebras formal-completions

asked 28 mins ago user745578 1,460

0

votes

0

answers

12

views

Generating Function for weak compositions

combinatorics generating-functions integer-partitions

modified 32 mins ago Anonymous 41

0

votes

1

answer

27

views

$\operatorname{Cov}(\mathbf{x,y})+\operatorname{Cov}(\mathbf{y,x})=2\operatorname{Cov}(\mathbf{x,y})$

covariance

modified 32 mins ago Bernard 155k

0

votes

0

answers

18

views

properties of vector space

linear-algebra

asked 35 mins ago unknown user 11

0

votes

0

answers

24

views

The Riemann sum definition.

calculus integration definite-integrals riemann-sum

modified 35 mins ago RobPratt 15.3k

0

votes

0

answers

8

views

Blow-Up of Quasiprojective Variety and Conormal Space

algebraic-geometry blowup tangent-bundle

modified 36 mins ago bark 73

0

votes

0

answers

24

views

+50

Proof question on lemma included in paper on invariant sets of PDEs

partial-differential-equations proof-explanation set-invariance

modified 37 mins ago Leif Ericson 276

3

votes

1

answer

898

views

Absolute value of eigenvalues of a $3 \times 3$ matrix

linear-algebra matrices eigenvalues-eigenvectors linear-transformations

modified 37 mins ago Community♦ 1

2

votes

0

answers

11

views

Do finitely additive measures solve the “problem of measure”?

measure-theory lebesgue-measure borel-measures

asked 39 mins ago WillG 2,735

2

votes

3

answers

22

views

Integration by Trig Substitution $u=a \tan(\theta)$

calculus integration trigonometric-integrals

answered 13 secs ago David K 70.9k

0

votes

0

answers

18

views

Comparing Binomial Random Variables and Negative Binomial Random Variables

probability

modified 40 mins ago Remy 7,621

0

votes

0

answers

12

views

Question about lemma in Dirichlet problem in a strip (conformal mappings) Stein and Shakarchi

complex-analysis

modified 42 mins ago Bernard 155k

1

vote

2

answers

21

views

element of a homotopy group

algebraic-topology homotopy-theory higher-homotopy-groups

answered 42 mins ago Eric Wofsey 248k

0

votes

0

answers

2

views

How to bound the 2-norm of a relatively small matrix?

linear-algebra matrices norm singular-values

asked 44 mins ago George C 341

1

vote

0

answers

14

views

Combinatorics permutation with letters and numbers

combinatorics

asked 50 mins ago StackOMeow 525

0

votes

0

answers

15

views

Understanding linear systems with infinite solutions

linear-algebra linear-transformations

modified 50 mins ago Maha 1,493

1

vote

1

answer

24

views

A quadratic $ax^2+bx+c$ has its roots in the interval $[0,1]$, find the maximum value of $\frac{(a-b)(2a-b)}{a(a-b+c)}$

algebra-precalculus quadratics

answered 52 mins ago heropup 84.5k

0

votes

0

answers

9

views

For each blowup at a singular point, the arithmetic genus decreases

algebraic-geometry singularity blowup

asked 58 mins ago rmdmc89 7,007

-1

votes

0

answers

19

views

Rate of Change Calculus 1

calculus word-problem

asked 1 hour ago nyima kunga 1

-1

votes

0

answers

15

views

Find Sum of Infinite Geometric Series (Alternating Odd Terms)

sequences-and-series geometric-series

asked 1 hour ago 324 453

1

vote

0

answers

54

views

Asymptotic behaviour of an integral. How should I proceed?

real-analysis integration asymptotics stochastic-calculus stochastic-differential-equations

modified 1 hour ago Strictly_increasing 223

0

votes

0

answers

41

views

How do you make an accurate, integrable approximation of $a \operatorname{mod} \left(\frac xb \right)$ with a scaling constant $N$?

modular-arithmetic approximation

modified 1 hour ago DUO 163

1

vote

1

answer

18

views

Get from weighted arithmetic mean to arithmetic mean

functions average

answered 1 hour ago heropup 84.5k

6

votes

1

answer

93

views

Prove that $n$ is a power of 2 in the following sets of sums

combinatorics contest-math

modified 1 hour ago richrow 2,206

-1

votes

0

answers

13

views

Solving polynomial: unknown coefficients in R

algebra-precalculus polynomials numerical-methods cubic-equations quartic-equations

modified 1 hour ago Raffaele 14.5k

0

votes

0

answers

6

views

Condition Number relationships of a specifically structured symmetric matrix

linear-algebra condition-number

modified 1 hour ago Damien 1,292

1

vote

1

answer

36

views

Application of Cayley’s theorem in Sylow’s theorem

abstract-algebra group-theory sylow-theory cayley-graphs

modified 1 hour ago Qiaochu Yuan 316k

0

votes

1

answer

23

views

$f:X \to Y$ is continuous if and only if for every subset A of $X$, $f(\overline{ A}) \subseteq \overline{f(A)}$

general-topology continuity

answered 1 min ago Nelli Kuukeri 81

-1

votes

0

answers

16

views

How to find the length of a side given medians of a triangle?

geometry median centroid

modified 1 hour ago Patrick 1

1

vote

0

answers

8

views

What are the ideals of Lie algebra of upper triangular $ n \times n $ matrices over a field $F$.?

abstract-algebra matrices lie-algebras ideals

modified 1 hour ago Hamada Al 810

0

votes

0

answers

15

views

Reynolds transport Theorem

fluid-dynamics

asked 1 hour ago user821193 1

0

votes

0

answers

10

views

Help with positive linear funcitonal exercise

linear-algebra inner-product-space

asked 1 hour ago Gabriel C. Barbosa 141

0

votes

0

answers

67

views

Why do we subtract by $81$?

combinatorics contest-math

modified 1 hour ago RobPratt 15.3k

0

votes

1

answer

11

views

$m_^R(E)=m_(E)$ where $m_*$ is an outer measure.

measure-theory outer-measure

modified 1 hour ago love_sodam 87

4

votes

1

answer

116

views

$23$ odd subsets of $\{1,2,…26\}$ such that intersection of every two is even. Can we find another odd set…

linear-algebra combinatorics solution-verification contest-math

modified 1 hour ago Aqua 74.9k

1

vote

1

answer

16

views

On a property of measure

real-analysis measure-theory lebesgue-measure

answered 1 hour ago Berci 75k

1

vote

0

answers

21

views

Derivative of $f(x)^T \cdot A(x) \cdot g(x)$ w.r.t. $x$

linear-algebra multivariable-calculus derivatives

modified 1 hour ago Integrand 6,742

0

votes

0

answers

7

views

Convex functional is the same thing as maximum of linear functionals

functional-analysis convex-analysis

asked 1 hour ago Daniel Li 2,374

1

vote

0

answers

19

views

Let $G$ be a connected graph. Prove that if $E(G)$ is greater than or equal to $V(G)$ then $G$ contains at least three edges that are not bridges.

graph-theory graph-connectivity

modified 2 hours ago RobPratt 15.3k

0

votes

0

answers

14

views

Probability for the $k$-th ace from bridge cards to show up in the $r$th trial

probability combinatorics solution-verification problem-solving card-games

modified 2 hours ago RobPratt 15.3k

1

vote

0

answers

14

views

Constrained optimization on a sphere - finding a specific curve

differential-geometry optimization optimal-control

asked 2 hours ago Damian 77

0

votes

0

answers

17

views

Ways to describe matrix whose elements are linear combinations of elements of a vector?

linear-algebra tensors linear-regression constraints

modified 2 hours ago wrobin 3

0

votes

0

answers

9

views

Distinction between “random choices made by the algorithm” and “sequence of actions the algorithm induces”

probability random-variables expected-value

asked 2 hours ago elexhobby 1,371

0

votes

0

answers

20

views

Explanation of why we move the decimal place two places to convert from decimal to percent

percentages decimal-expansion

asked 2 hours ago user710744 115

0

votes

0

answers

15

views

Restrictions on laws 2

algebra-precalculus logarithms exponentiation radicals

modified 2 hours ago Al3dium GD 43

2

votes

0

answers

52

views

+50

Semiprime ideal of non-Noetherian Lie algebra

abstract-algebra lie-algebras ideals maximal-and-prime-ideals noetherian

modified 2 hours ago Hamada Al 810

1

vote

0

answers

13

views

What is the probability that sum of balls in any subset of a group is divisible by 3?

probability combinatorics

asked 2 hours ago naman jain 11

1

vote

1

answer

15

views

$*$-homomorphism induced by a c.p.c order zero map

operator-theory operator-algebras c-star-algebras

modified 2 hours ago Aweygan 19.8k

0

votes

0

answers

15

views

Change of coordinates in vector field

differential-geometry

asked 2 hours ago George K 490

0

votes

0

answers

12

views

Probability that atleast $3$ from $5$ dice show the same face

probability solution-verification combinations

asked 2 hours ago Quasar 1,987

0

votes

0

answers

8

views

How to find the symmetries of a curve?

algebra-precalculus graphing-functions symmetry

asked 2 hours ago Featherball 165

2

votes

1

answer

40

views

Partial derivatives of a complex function?

complex-analysis derivatives partial-derivative mobius-transformation

modified 2 hours ago Vercassivelaunos 3,293

0

votes

0

answers

11

views

Uniform parametrisation of $SO(3)$

metric-spaces topological-groups

asked 2 hours ago Radost 1,590

0

votes

0

answers

22

views

Prove that $F$ is a bounded set, and that $\sup F = \alpha^2$ .

real-analysis supremum-and-infimum

modified 2 hours ago Arctic Char 4,923

0

votes

0

answers

11

views

Density in higher order Sobolev space

functional-analysis sobolev-spaces

modified 2 hours ago Arctic Char 4,923

0

votes

0

answers

9

views

Question about Productive Opportunities and Risk Bearing Optimum

probability optimization decision-theory decision-problems

modified 2 hours ago Jane 13

2

votes

1

answer

37

views

Group law of $\operatorname{Spec} \mathbb{Z}[x,x^{-1}]$

algebraic-geometry commutative-algebra

modified 2 hours ago KReiser 30.1k

1

vote

2

answers

70

views

What are advantages to prove divergence of $\sum a_n^2/n$ instead of, say $\sum a_n^2$, or even $\sum a_n$ itself?

real-analysis calculus sequences-and-series convergence-divergence

modified 2 hours ago Oliver Diaz 9,085

11

votes

1

answer

2k

views

Group presentation of $A_5$ with two generators

abstract-algebra group-theory alternative-proof symmetric-groups group-presentation

modified 2 hours ago Daryl Cooper 101

2

votes

0

answers

18

views

Pushout and open cover and sheaves

general-topology algebraic-topology

modified 2 hours ago curious math guy 1,054

0

votes

0

answers

12

views

Inverse Discrete Fourier Transform in Matlab

matlab greens-function fast-fourier-transform

asked 2 hours ago FluidMan 35

0

votes

0

answers

14

views

What is Conditional Event Algebra (requesting a simpler explanation than Wikipedia)?

probability probability-theory intuition conditional-probability algebras

asked 2 hours ago user10478 1,351

0

votes

0

answers

13

views

Analog of uniform integrability and DCT for infinite series

real-analysis measure-theory

modified 2 hours ago HallaSurvivor 7,210

2

votes

1

answer

31

views

How to determine dimension for basis?

linear-algebra vector-spaces

modified 3 hours ago Anantha Krishna B 1

2

votes

1

answer

37

views

Unions and inverse image in a topos

category-theory topos-theory

answered 3 hours ago Daniel Schepler 13.3k

8

votes

2

answers

4k

views

Is there a memorable solution to Kirkman's School Girl Problem?

combinatorics alternative-proof combinatorial-designs

modified 3 hours ago Marco 1

3

votes

0

answers

36

views

Solution verification of Exercise 8.2.6 Terence Tao Vol1

real-analysis solution-verification

modified 3 hours ago 0-th User 6,221

1

vote

2

answers

35

views

Which number or numbers could be in the middle?

number-theory proof-writing

answered 3 hours ago Hagen von Eitzen 327k

3

votes

1

answer

794

views

Number of distinct Arrays formed from swapping pairs

combinatorics permutations

modified 3 hours ago Community♦ 1

11

votes

0

answers

433

views

Fabius function and equivalent

ordinary-differential-equations limits probability-distributions special-functions

modified 4 hours ago Varun Vejalla 4,395

6

votes

0

answers

34

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 recreational-mathematics

asked 4 hours ago Vepir 9,967

4

votes

0

answers

27

views

Efficient summation of multiplicative functions on intervals

multiplicative-function computational-number-theory

modified 4 hours ago Thurmond 895

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