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2

votes

1

answer

300

views

Distance between point and plane

multivariable-calculus vectors

answered 20 secs ago ThunderGod763 46

1

vote

0

answers

34

views

Zeros of Riemann-Zeta function

number-theory

modified 1 min ago Mohsen Shahriari 3,713

0

votes

1

answer

22

views

Is the expected conditional survival related to the hazard function?

probability

answered 2 mins ago BlueCharlie 126

0

votes

0

answers

3

views

Prove that $q(x,y)=Ax^2+2Bxy+Cy^2$ is definite positive

linear-algebra quadratic-forms positive-definite symmetric-matrices bilinear-form

asked 2 mins ago Ivan Bravo 117

0

votes

0

answers

10

views

Why is the image under integration of a uniformly bounded subset of $C[a,b]$ necessarily compact?

real-analysis equicontinuity arzela-ascoli

asked 6 mins ago Aphyd 500

0

votes

0

answers

5

views

the number of customers served during busy period for an M/M/1 queue

stochastic-processes poisson-process queueing-theory

modified 6 mins ago one user 3

47

votes

1

answer

1k

views

Limit associated with a recursion

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

modified 7 mins ago Community♦ 1

0

votes

0

answers

5

views

Determining the leading coefficient of Vandermonde's Determinant.

linear-algebra polynomials determinant

asked 9 mins ago mar.machine 1

0

votes

1

answer

23

views

A fair six-sided die is rolled repeatedly until three sixes are rolled consecutively. What is the expected number of rolls?

probability expected-value dice

answered 10 mins ago angryavian 56.4k

0

votes

1

answer

24

views

Show that $\gcd(a,b)=1$ if and only if $\gcd(a^m,b)=1$

elementary-number-theory

answered 13 mins ago zwim 17.1k

2

votes

1

answer

27

views

Calculating distance when velocity is given

integration

modified 16 mins ago user1337 8,059

0

votes

0

answers

22

views

Probability of a rational nearest neighbor of an irrational

probability probability-theory measure-theory

modified 21 mins ago MONODA43 399

0

votes

0

answers

12

views

Proving $\dfrac {a}{a+b}+\dfrac{b}{b+c}+\dfrac{c}{c+a} \ge \dfrac 32 \cdot \sqrt[6]{\dfrac{ab+bc+ca}{a^2+b^2+c^2}}$

inequality alternative-proof uvw buffalo-way

asked 23 mins ago knvy144444 831

0

votes

0

answers

30

views

How fast does $\lim_{ t \to 0} E \left[ \|Z\|^2 1_{B}(X,X+\sqrt{t} Z) \right]= E \left[ \|Z\|^2 \right] E[1_B(X)]$

probability probability-theory normal-distribution expected-value

modified 25 mins ago Boby 4,530

0

votes

0

answers

10

views

Why is the exact relationship between a Gaussian p.d.f. and its associated probability measure and random variable?

probability-theory measure-theory statistics random-variables density-function

modified 26 mins ago nbro 5,173

0

votes

0

answers

27

views

Haagerup norm on C${}^*$ algebras

functional-analysis tensor-products tensors c-star-algebras von-neumann-algebras

modified 31 mins ago Alonso Delfín 5,009

0

votes

0

answers

48

views

Finding Pre-images of Periodic Points on Julia Sets close to the Period-3 Cardioid

complex-numbers recreational-mathematics fractals fixed-points complex-dynamics

modified 31 mins ago Ibrahim Mahmoud 153

3

votes

4

answers

93

views

If $f(x)=x^{2}$ and $g(x)=x \sin x+\cos x$; Find out the no of intersecting point

real-analysis polynomials problem-solving

modified 34 mins ago miracle173 8,409

0

votes

1

answer

10

views

Formula for computing probabilities of final outcomes when a coin is flipped between two lotteries

probability finance

answered 34 mins ago Henry 118k

0

votes

1

answer

11

views

Can inflection points be determined from the local extrema of the first derivative?

calculus

answered 37 mins ago Aaron Kirk 38

0

votes

0

answers

41

views

A conjecture (very probably false) about 3x+1 problem

number-theory collatz-conjecture

modified 41 mins ago Integrand 5,621

0

votes

1

answer

7

views

Help with Independent Probability Problem

probability combinatorics discrete-mathematics independence dice

answered 42 mins ago Henry 118k

0

votes

1

answer

36

views

Visualizing the total differential

calculus multivariable-calculus derivatives

answered 43 mins ago joshuaronis 1,153

0

votes

0

answers

9

views

Prove that every Hilbert space is weakly complete.

functional-analysis

asked 46 mins ago Wafy Mahmoud 1

4

votes

1

answer

90

views

Interpretation of probability statements in Nina Zubrilina's paper

probability combinatorics graph-theory

answered 46 mins ago Misha Lavrov 68.7k

2

votes

1

answer

35

views

Inscribing equilateral triangle in square — mistake in historical work by Abu'l-Wafa Al-Buzjani?

euclidean-geometry math-history

answered 49 mins ago heropup 81.5k

0

votes

0

answers

19

views

Is it possible to find $x^2$ in terms of $a$ in this equation?

trigonometry problem-solving fundamental-solution

asked 55 mins ago Laura 45

0

votes

0

answers

7

views

Independence of the sample mean and $S_{XX}$ using Projection Theory

statistics normal-distribution statistical-inference distribution-theory

asked 55 mins ago EM823823 255

0

votes

0

answers

6

views

Plot correlation between two dependent variables by generating samples from conditional CDF

analysis probability-theory conditional-probability correlation

modified 58 mins ago Michael Hardy 238k

1

vote

1

answer

15

views

Inverse of matrix plus identity

linear-algebra matrices symmetric-matrices

modified 59 mins ago Robert Lewis 61.3k

3

votes

1

answer

102

views

The upper bound of the effective stepsize of the Adam optimizer

optimization machine-learning

answered 1 hour ago John Jiang 480

2

votes

0

answers

45

views

Geometric intuition of perpendicular complex vectors

linear-algebra geometry complex-numbers

modified 1 hour ago Ted Shifrin 81.4k

0

votes

1

answer

23

views

Point lying on Jerabek Hyperbola

geometry triangles conic-sections triangle-centres

modified 1 hour ago A Z 75

1

vote

0

answers

11

views

Groups of permutations of rectangular matrices

combinatorics matrices group-theory

asked 1 hour ago Matias Agelvis 111

1

vote

1

answer

12

views

Can we really compose random variables and probability density functions?

probability-theory measure-theory statistics random-variables function-and-relation-composition

modified 1 hour ago nbro 5,173

0

votes

0

answers

19

views

Meaning of Repeated Eigenvalues

dynamical-systems control-theory nonlinear-system

asked 1 hour ago FourierFlux 379

0

votes

0

answers

42

views

Is this Riemann Zeta equation correct?

riemann-zeta

modified 1 hour ago Taylor Rendon 847

1

vote

1

answer

36

views

Consider the function $f(x) = x^2 + 2$ mod $17$. Use the two-pebble algorithm to determine the following parameters for starting point $x = 0$.

functions

modified 1 hour ago lonza leggiera 8,401

0

votes

0

answers

38

views

Fundamental theorem of order - when are powers equal?

abstract-algebra group-theory

modified 1 hour ago user1787812 141

0

votes

1

answer

10

views

Proof of equivalence of two statements about relationship between two generating functions

sequences-and-series power-series solution-verification generating-functions

answered 1 hour ago Brian M. Scott 509k

-1

votes

0

answers

9

views

How many repeated numbers should I throw after n throws to achieve a desired probability

probability dice

asked 1 hour ago Agustín Prieto 1

1

vote

1

answer

34

views

Are there necessarily positive and negative points to this function?

calculus integration

answered 1 hour ago Pacciu 5,350

0

votes

0

answers

15

views

Uniform Probability Measure on a Finitely Generated Group

group-theory measure-theory analytic-group-theory

asked 1 hour ago user193319 5,774

0

votes

1

answer

8

views

a group $G$ whose order has exactly two prime divisors is not simple, Burnside theorem?

group-theory simple-groups

answered 1 hour ago Hagen von Eitzen 323k

1

vote

1

answer

15

views

Show that $pAp$ is a $C^$-subalgebra of a $C^$-algebra $A$.

c-star-algebras

answered 1 hour ago Alonso Delfín 5,009

0

votes

0

answers

14

views

A few questions regarding using Markov/Chebyshev and writing the Lebesgue measure in terms of the Lebesgue Integral

real-analysis measure-theory lebesgue-integral lebesgue-measure

asked 1 hour ago User7238 544

0

votes

1

answer

25

views

Alteration in Binary Strings Question

combinatorics discrete-mathematics solution-verification computer-science binary

answered 1 hour ago Gareth Ma 1,616

1

vote

1

answer

18

views

Given $N, b$ find the largest value of $k$ such that $N=a \times b^k$. $a,b,k,N \in \mathbb{Z}$

number-theory

modified 1 hour ago Rhys Hughes 9,285

1

vote

0

answers

21

views

translation of a Jordan region

real-analysis calculus multivariable-calculus solution-verification volume

modified 1 hour ago Gord452 325

0

votes

1

answer

6

views

Dense Subspace of Extremally Disconnected Space is Extremally Disconnected

general-topology separation-axioms

answered 1 hour ago Brian M. Scott 509k

1

vote

0

answers

37

views

Prove that the function is no-negative, connections to Fourier transform of $\exp(-|x|^{\alpha})$

real-analysis probability fourier-analysis special-functions positive-definite

modified 1 hour ago mattos 3,179

0

votes

0

answers

23

views

Vector field flow on manifold, Lie brackets

general-topology differential-geometry manifolds differential-topology

modified 2 hours ago Luka 469

9

votes

1

answer

235

views

The Broken Calculator Problem

probability probability-distributions recreational-mathematics expected-value calculator

modified 2 hours ago Steve V. 147

4

votes

1

answer

1k

views

smooth embedding between manifolds

general-topology differential-geometry manifolds

modified 2 hours ago Community♦ 1

0

votes

1

answer

28

views

Upper bound for amount of intervals in intersection of interval sets

real-analysis real-numbers real-algebraic-geometry interval-arithmetic

answered 2 hours ago Brian M. Scott 509k

1

vote

0

answers

25

views

Maximize area spanned by convex hull of a permutation

permutations convex-geometry discrete-optimization discrete-geometry convex-hulls

modified 2 hours ago Rodrigo de Azevedo 15.7k

2

votes

2

answers

31

views

Distribution of the ratio of two Normal variables

statistics probability-distributions normal-distribution

answered 2 hours ago Michael Hardy 238k

-1

votes

0

answers

23

views

Rotation Matrix between two unit direction vectors from different frames

linear-algebra matrices 3d rotations

modified 2 hours ago esdi 1

0

votes

0

answers

26

views

Question related to dot product of fields with area

general-topology vectors area vector-fields

modified 2 hours ago Anindya Prithvi 33

0

votes

1

answer

27

views

Analytic continuation of a function defined on a discrete set

complex-analysis analytic-continuation

modified 2 hours ago Conrad 11.1k

1

vote

0

answers

36

views

Is it possible to rewrite this proof in a more intuitive form?

proof-writing proof-explanation first-order-logic

modified 2 hours ago Patrick Browne 195

0

votes

0

answers

10

views

Replacing $y$ by $y\xi^k$ and Performing the Factorization

ring-theory proof-explanation ideals roots-of-unity unique-factorization-domains

modified 2 hours ago Andrew 480

2

votes

1

answer

50

views

How to prove that $\mathbb{E}[R_n]=o(\sqrt{n})$

probability probability-theory

answered 2 hours ago BlueCharlie 126

1

vote

0

answers

23

views

Using the Argument Principle, evaluate $\int_{|z|=4}\frac{2z\sin(z)+z^2\cos(z)}{z^2\sin(z)}dz$.

complex-analysis complex-numbers complex-integration

modified 2 hours ago jameselmore 4,921

1

vote

0

answers

18

views

How can I find CNF of ( A and B or C ) and (B or not C) using Karnaugh map?

logic

modified 2 hours ago Subhasish Mukherjee 48

0

votes

0

answers

12

views

Rank of 3-fold tensor in terms of matrix unfoldings proof

linear-algebra tensors multilinear-algebra

asked 2 hours ago David Warren Katz 875

2

votes

0

answers

57

views

Showing that $(\mathbb{C}[x,y]/(xy))_x\cong \mathbb{C}[x]_x$

abstract-algebra algebraic-geometry commutative-algebra localization

modified 2 hours ago ponchan 1,059

1

vote

0

answers

48

views

Proof-verification of theorem related to Wieferich Criterion for Fermat's Last Theorem

elementary-number-theory diophantine-equations

modified 2 hours ago element 21

0

votes

0

answers

13

views

Constructing joint confidence intervals.

probability normal-distribution hypothesis-testing

asked 2 hours ago Rohit Pandey 3,686

0

votes

0

answers

15

views

With Khinchine's inequality, prove Fourier basis is unconditional in $L^{p}[0,1]$ only for $p=2$.

banach-spaces harmonic-analysis schauder-basis

modified 2 hours ago Eric Yan 43

0

votes

0

answers

13

views

Proof Explanation: Proving a $0$ Residue Modulo Ideal

ring-theory proof-explanation divisibility ideals unique-factorization-domains

modified 2 hours ago Andrew 480

0

votes

1

answer

17

views

Generalized remainder theorem for non linear factors

polynomials

modified 2 hours ago jaRedDRedmp 69

10

votes

0

answers

79

views

Proof a 'well-known' result of Shimura on periods of modular forms

reference-request p-adic-number-theory modular-forms l-functions

modified 3 hours ago Arbutus 1,789

1

vote

1

answer

34

views

Bijection between $\mathrm{Hom}(D,-)$ functor exact sequnce and $F \leftrightarrow (g,f) $

abstract-algebra modules

modified 3 hours ago user26857 41.9k

0

votes

0

answers

13

views

Complex structures on del Pezzo surfaces

algebraic-geometry complex-geometry

modified 3 hours ago KReiser 28.1k

0

votes

0

answers

28

views

Subrings/subalgebras of $\mathbb Z[x]$

abstract-algebra polynomials

asked 3 hours ago mathquestion 1

-1

votes

0

answers

14

views

Sufficient Condition to be Hilbert Space: Convergence of series of orthonormal vectors with $\ell^2$ coefficients implies completeness?

functional-analysis analysis hilbert-spaces inner-product-space

asked 3 hours ago LucasSilva 634

3

votes

1

answer

23

views

Prove that biconditional cannot be expressed in terms of implication alone.

logic

modified 3 hours ago Angina Seng 140k

0

votes

0

answers

5

views

Positive Quadratic Variation implies infinite total variation

reference-request brownian-motion quadratic-variation total-variation

modified 3 hours ago Michael Hardy 238k

0

votes

0

answers

17

views

bounded Cantor pairing?

functions cantor-set poker

modified 3 hours ago Bernard 152k

0

votes

0

answers

15

views

Using Runge-Kutta integration to increase the speed and stability of gradient descent?

ordinary-differential-equations numerical-methods least-squares gradient-descent runge-kutta-methods

modified 3 hours ago Luke Hutchison 133

1

vote

0

answers

21

views

Should $X$ be full column rank in normal Gauss Markov model to make $(\mathbf{y'y},\mathbf{X'y})$ be a complete statistic?

linear-algebra statistics statistical-inference regression parameter-estimation

modified 3 hours ago Facet 11

1

vote

1

answer

24

views

How to make function that calculates the probability of two bugs will meet within $8$s timesteps?

probability logic

modified 3 hours ago Khashayar Baghizadeh 760

1

vote

0

answers

22

views

How to solve a Bernoulli ODE with an additional term?

ordinary-differential-equations partial-differential-equations

modified 3 hours ago BenG73 103

5

votes

1

answer

65

views

Book Request - General Relativity (for mathematicians)

differential-geometry reference-request book-recommendation general-relativity

answered 3 hours ago Taylor Rendon 847

0

votes

0

answers

13

views

Restriction of an Exceptional Divisor $ E $ to itself is $ E^{2} = -H $ in $ E. $

algebraic-geometry

asked 3 hours ago AG Novice 405

0

votes

0

answers

9

views

Doesn't the simplex method work without artificial variables?

linear-programming simplex two-phase-simplex

asked 3 hours ago J R Smart 1

0

votes

0

answers

7

views

Test for equality between two discrete distributions with lots of ties

statistics

asked 4 hours ago user3139990 23

2

votes

1

answer

49

views

Find $a,b,c$ if ${(1+3+5+…a)}+{(1+3+5+…b)}={(1+3+5+…c)}$

sequences-and-series solution-verification

modified 4 hours ago Aqua 72.6k

4

votes

0

answers

30

views

Does this orthogonal matrix parametrization have a name?

linear-algebra orthogonal-matrices

asked 4 hours ago Andrea Allais 91

0

votes

0

answers

6

views

Mode decomposition and eigenvalues of radial Schroedinger operators in N-dimensions

spectral-theory eigenfunctions minimal-surfaces

asked 4 hours ago user2020 1

0

votes

2

answers

38

views

Finding the general term of this sequence $u_{n+1}+u_n=n$

sequences-and-series

answered 4 hours ago Brian M. Scott 509k

6

votes

1

answer

521

views

Cevians $AD$, $BE$, $CF$ are concurrent, as are cevians $DP$, $EQ$, $FR$; show that $AP$, $BQ$, $CR$ are concurrent

geometry contest-math euclidean-geometry triangles plane-geometry

modified 4 hours ago Batominovski 46.2k

3

votes

0

answers

25

views

Comparing the cardinalities of generic $\mathbb{R}$s

logic set-theory axiom-of-choice descriptive-set-theory forcing

modified 4 hours ago Noah Schweber 170k

0

votes

0

answers

11

views

Maximality of an ideal implies co-maximality

abstract-algebra ring-theory

asked 5 hours ago Gitika 323

2

votes

0

answers

17

views

Example of distinct Lie algebras with the same derivation algebra?

lie-algebras

modified 5 hours ago Dry Bones 21

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