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Interesting 42 Bountied Hot Week Month
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Index notation for scalar products and gradients

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rose
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Possible conditions for a function to belong to $L^2$

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Santos
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2 votes
1 answer
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Confusion about model-theoretic argument applied to algebraically/real closed fields

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Chris Eagle
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1 answer
44 views

Geogebra special segment construction

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KDP
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1 answer
60 views

Theorem 3.15 Linear Algebra Friedberg, Insel and Spence how is my counterexample wrong?

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Arturo Magidin
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I can't solve this second order non linear ODE, please help

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Grande Dorgas
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$g(z) = \sum_{n=0}^{\infty} \frac{g(n)}{n!} z^n$ with $0 \leq g(n)$?

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mick
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2 votes
1 answer
1k views

The equation of a surface created by the extrusion of a 2D closed curve along a path

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CommunityBot
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-1 votes
1 answer
23 views

What property is being used to simplify this logarithm? $ 4^{log_2 n} = n^2$

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J. W. Tanner
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13 views

Opinion of "Mathematical Analysis Canuto-anita"

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Ramiro Sato
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1 vote
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G-invariant Tietze Extension Theorem

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Ted Shifrin
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0 answers
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Geometric proof of $|\frac{e^{j\theta} - a}{1 - ae^{j\theta}}| = 1$

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Ted Shifrin
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2 answers
36 views

Search for a proof of Moser's inequality

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Calvin Lin
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9 views

Bounded seccond derivative also bounds the function

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Ted Shifrin
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0 answers
11 views

solving mehta integral using induction

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Document123
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1 answer
38 views

Find sum of $\sum_{n=1}^{\infty}\frac{14}{49n^2-84n-13}$ series

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José Carlos Santos
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0 answers
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Prove that exists unique bimodule structure of $\text{Hom}_A(M,N)$

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Christian Coronel
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1 answer
45 views

Show that $\sum_{n=1}^{\infty} \frac{(-1)^n (\psi(n) - \psi(2n))}{n} = \frac{\pi^2}{16} + \left(\frac{\ln(2)}{2}\right)^2$

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Nanayajitzuki
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-3 votes
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Hello everyone ! I need to prove this fx = x^n and fx ‘ = nx ^n-1 I calculated but I don’t know what should I do next , please help!

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anomaly
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-2 votes
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Is the statement true or false? [closed]

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Passion Perspective
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0 answers
18 views

Hodge Star and $\partial$-Harmonicity

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Ted Shifrin
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3 views

Discuss the application of the two forms of Green's theorem with example.

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Rishita Dogra
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1 vote
2 answers
40 views

Is this corollary in fact false when $p=1$?

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Andrew
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2 votes
0 answers
20 views

zero set of a bounded variation function on $\mathbb{R}^3$

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asdf
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Applying log on a generating function

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Benian
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0 answers
17 views

Why does the area under the curve tell us anything about the function?

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ZenPyro
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14 views

Bijectivity and smoothness of nonautonomous ODE solution

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Vokram8
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4 votes
1 answer
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Proof that a series converges to zero

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Davide Giraudo
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6 votes
1 answer
212 views

Different Approaches for Proving Kantorovich Inequality

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Hosein Rahnama
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2 votes
1 answer
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Convexity of a region on probability simplex

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CommunityBot
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1 vote
1 answer
22 views

Confused about Hilbert Space basis/dual basis properties

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Tzimmo
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1 vote
1 answer
31 views

When solving Logarithmic Inequalities why are the two following methods not the same?

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LEF
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36 views

Meaning of Φ : Y → X

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J. W. Tanner
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3 votes
1 answer
64 views

About $f(x) = \frac{\sum_{n=1}^{\infty} \sin^2(x/n)}{x}$

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Polygon
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3 votes
1 answer
56 views
+100

Topology induced by generalised absolute values

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Carlyle
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0 answers
21 views

Differential forms, antisymmetry, and integrals

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bkocsis
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5 votes
0 answers
118 views

Can this be done? Split Pascal's triangle (without the $1$s) with a straight line into two regions of equal sums.

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Dan
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33 views

Apparent contradiction to Atiyah-Krull-Schmidt

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1 answer
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The center of mass of a semiellipsoid

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John Alexiou
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25 views

$F(a_1,\ldots,a_{n-1})(a_n)=F(a_1,\ldots,a_n)$

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isaac098
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1 answer
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Splitting $2\times2$ or $3\times3$ matrix into two matrices under boundary conditions

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MiB_Coder
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1 vote
1 answer
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Convex optimization problem with quadratic constraint

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Titan
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1 vote
0 answers
14 views

Can a birational morphism contract a positive ray?

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How many 7-digit numbers with distinct digits can be made that are divisible by 3?

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Peter Phipps
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39 views

$\mathrm{Hom}_R (R/(x),R)\cong M$ for $R=k[x,y]/(xy)$. $M=R/(x)$

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Anthony
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27 views

find the volume of the cylinder $x^2 + y^2 = 4$ outside of the cone $z = \sqrt{x^2 + y^2}$ using spherical coordinates

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Sine of the Time
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42 views

Approximation in terms of outer measure

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KK slider
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1 answer
27 views

How to calculate the surface area of the elliptical paraboloid given by $z=x^2 + 4y^2$

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user317176
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1 answer
21 views

Proving a recurrence relation involving n choose r

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Marko Riedel
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28 views

Is ratio exponentially concentrated if nominator and denominator are?

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user18722294
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0 answers
6 views

Riemann normal coordinates at the origin for a circular paraboloid whose vertex is at the origin and whose axis is the $z$-axis

Simon M's user avatar
Simon M
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1 vote
1 answer
43 views

underdetermined polynomial interpolation for a function $f$

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Shawn McAdam
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0 votes
0 answers
17 views

Inconsistent Triad Conjecture

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Yanko
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0 answers
11 views

Checking the Existence of solution to the DE given initial values

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Dominic Joseph
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-1 votes
0 answers
8 views

How to apply union bound to get the 1st inclusion and exclusion inequality

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Jiajun Li
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1 vote
0 answers
16 views

If $sup_{m\geq n} |f_n(x)-f_m(x)|$ converges in measure to $0$, then $f_n$ converges almost everywhere

Philip's user avatar
Philip
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0 answers
24 views

Intuitive reason why $|f_X(x)dx| = |f_Y(x)dy|$?

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FountainTree
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0 answers
8 views

Cost Estimate Error

user1260014's user avatar
user1260014
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1 vote
1 answer
41 views

Transform Lagrangian with a square root

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Qmechanic
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3 votes
0 answers
31 views

Axler. Linear Algebra Done Right. 3rd Edition, Exercises 3D, Problem 18

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QuantumSuperfield
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2 votes
0 answers
21 views

Taylor series at singular points in algebraic geometry

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David Melo
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1 vote
0 answers
30 views

Existence of a hyper plane

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Michh
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0 votes
3 answers
95 views

What does it mean to assume an axiom is “true” in mathematics?

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Bram28
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0 answers
13 views

inhomogeneous Helmholtz equation does not obey superposition using FEM

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J. W. Tanner
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0 votes
0 answers
24 views

Help to build a basic proof on orthonormal basis in Elementary Linear Algebra.

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Z8Michael
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0 answers
5 views

numerically compute eigenfunctions of $a(u,v)=\langle f(\nabla u)\nabla u,\nabla v\rangle_{L^2}$

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0xbadf00d
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0 votes
0 answers
11 views

Infinite kernels of profinite integers when considered as endomorphisms of $\mathbb{Q}/\mathbb{Z}$

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Orr Sela
  • 1
3 votes
1 answer
82 views
+100

Independence is preserved by joint weak convergence

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Christophe Leuridan
  • 7,219
0 votes
0 answers
12 views

Graph of a polytope as intersection of closed halfspaces

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Wrloord
  • 1,446
0 votes
0 answers
9 views

2D Geometry, Rotating line V line intercept

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Blindman67
  • 129
0 votes
0 answers
7 views

Packing problem in the 3D cube - generalisation of the Loomis-Whitney / Finner / Brascamp–Lieb / Holder inequality

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MarcO
  • 145
1 vote
0 answers
8 views

Balanced graph partitioning for d regular graphs

Inon Kaplan's user avatar
Inon Kaplan
  • 11
3 votes
0 answers
28 views

Can one reduce the study of unbounded operators to the one of bounded operators?

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Sylv_
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0 answers
9 views

calculating second order finite difference stencil

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blov
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1 vote
0 answers
20 views

percentage unite (problem solving for primary school)

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Midica Milovanovic
  • 11
1 vote
0 answers
10 views

Compactness criterion for subsets in a fractional sobolev space

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MackeyTopology
  • 718
1 vote
0 answers
20 views

Computing Point Spectrum and Resolvent of Multiplication Operator on [0,1]

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Mud
  • 71
2 votes
0 answers
18 views

If $G$ is a compact Lie group, does $C(G)$ admit a Schauder basis?

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Andre Gomes
  • 2,099
7 votes
4 answers
4k views

Calculate position based on angles between three known points

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John Alexiou
  • 13.1k
0 votes
0 answers
17 views

Use spherical coordinates to evaluate the following integral

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Ahmed Sakib
  • 1
0 votes
0 answers
35 views

Partitions of Polynomials - Soft Question

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Mako
  • 163
4 votes
0 answers
71 views

How many connected nonisomorphic graphs of N vertices given certain edge constraints?

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Todd Lehman
  • 351
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0 answers
14 views

Determinant Formula for Wedge Product via Universal Property of Exterior Powers

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Joshua Yagupsky
  • 1
0 votes
0 answers
13 views

Bounded extension of an operator with limited numerical range

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AaronSean
  • 1
2 votes
0 answers
27 views

Dual version of a generalization of Erdös-Beck theorem

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Alex Ortiz
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2 votes
0 answers
24 views

Write a symmetric matrix of rank $r$ as the sum of $r$ matrices, each having a rank of 1

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Mason Rashford
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0 answers
41 views

A tensor is invariant under diffeomorphism.

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mikeqwertyuiop
  • 75
4 votes
2 answers
2k views

Probability two (specific) independent Markov chains are some time at the same state

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CommunityBot
  • 1
5 votes
1 answer
49 views

Monochromatic square in colored plane

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Misha Lavrov
  • 137k
2 votes
0 answers
8 views

Number of rational points of orthogonal groups

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sunkist
  • 1,093
0 votes
0 answers
9 views

Differentiability & Partial Derivatives: Existence at a point Vs. Continuity at a point

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Cassius12
  • 395
1 vote
1 answer
59 views

Solve Composoition of Linear Least Squares with L2 and L2 Squared Regularization

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Royi
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-1 votes
0 answers
18 views

How to find work done by the vector field?

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Anton Vrdoljak
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1 vote
0 answers
11 views

Find the number of n-long sequences of complex numbers that form the beginning of some $\lambda$ -sequence.

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Will byers
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0 votes
0 answers
11 views

constant spectral density and causality of time series processes

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J. W. Tanner
  • 59.7k
2 votes
0 answers
15 views

Is the tensor product of W*-algebras commutative?

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