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5

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How to prove that a non-linear system is invariant?

ordinary-differential-equations

asked 1 min ago user6789 21

0

votes

0

answers

6

views

Pushforward of fundamental class under rational function

general-topology complex-analysis algebraic-topology complex-geometry

asked 4 mins ago Lamda8 671

0

votes

0

answers

10

views

Number of possible passwords - combinatorics

combinatorics discrete-mathematics

asked 5 mins ago Summand 131

3

votes

1

answer

26

views

what function follows $\int_{a}^{2a} f(z) dz = \cos(a)$ where $a$ and $z \ne 0$ and $f(z)$

calculus integration trigonometry

answered 5 mins ago Chris Custer 41.7k

1

vote

0

answers

6

views

Left adjoint to inverse image sheaf

category-theory sheaf-theory adjoint-functors

asked 5 mins ago user850424 527

0

votes

0

answers

4

views

Queuing service and almost sure convergence

real-analysis probability limits convergence-divergence

asked 6 mins ago Lola1993 3

0

votes

0

answers

3

views

about anova table

statistics anova

asked 6 mins ago jamie z 1

0

votes

0

answers

14

views

A confusion about showing $g$ is a unit in which ring.

number-theory polynomials solution-verification irreducible-polynomials polynomial-rings

modified 7 mins ago mathmusic 159

-1

votes

1

answer

11

views

Need help with surjective/injective

complex-analysis functions complex-numbers

answered 8 mins ago mythicdream 1

0

votes

0

answers

8

views

completing the square equation

roots square-numbers

asked 8 mins ago Joshua John 1

0

votes

0

answers

21

views

Prove that in an ordered integral domain $x^2 + e = 0$ has no solution.

abstract-algebra ring-theory integral-domain

modified 10 mins ago Ghost2020 1

1

vote

1

answer

8

views

Doubts about one charaterization of the naturality on adjuntions

category-theory

answered 13 mins ago Mark Saving 2,433

1

vote

1

answer

18

views

Prove that if locally compact group $G$ is discrete, then the group algebra $L^1(G)$ is unital.

functional-analysis measure-theory harmonic-analysis

answered 13 mins ago Ruy 11k

0

votes

1

answer

21

views

Summation by parts as a case of integration by parts

integration measure-theory dirac-delta summation-by-parts

answered 13 mins ago Masacroso 22.5k

1

vote

0

answers

10

views

Determine if the series representation is true or not

calculus summation power-series factorial

asked 14 mins ago Math a 65

0

votes

1

answer

14

views

Problem with defintion of an equivalence relation induced by an arbitrary class

elementary-set-theory equivalence-relations set-partition

answered 14 mins ago Brian M. Scott 565k

2

votes

1

answer

48

views

Is the following principle correct?

inequality positive-semidefinite hermitian-matrices

modified 15 mins ago Malkoun 4,318

0

votes

0

answers

5

views

How can the equation of force for a spring and damper in series simplify to just the equation for a spring if the damper is set to “zero”?

systems-of-equations dynamical-systems classical-mechanics fluid-dynamics

modified 15 mins ago mike 287

0

votes

1

answer

9

views

Complex numbers finding real values

complex-numbers polar-coordinates

modified 15 mins ago Giorgos Giapitzakis 550

0

votes

0

answers

10

views

How to put math equations in HTM web page?

computer-science

asked 17 mins ago Kimball Wang 1

2

votes

0

answers

16

views

Show that $H(x):=\frac{1}{|x|^{n-2}}u(\frac{x}{|x|^2})$ is harmonic if u is harmonic

integration multivariable-calculus partial-differential-equations harmonic-functions laplacian

modified 18 mins ago Vigej 21

0

votes

0

answers

6

views

Finding a feasible solution in P-time? (or proving infeasibility)

polynomials algorithms quadratic-programming

modified 18 mins ago gt6989b 50k

0

votes

0

answers

3

views

Proof that reparametrized curves are homotopic

real-analysis differential-geometry homotopy-theory curves parametrization

asked 20 mins ago Octavius 384

-1

votes

0

answers

8

views

Regularity of curves

homotopy-theory curves parametric

modified 21 mins ago Geoff 880

2

votes

1

answer

1k

views

Integrating the intersection of two cylinders $x^2+y^2=1$ and $y^2+z^2=1$.

integration geometry multivariable-calculus

modified 23 mins ago Community♦ 1

1

vote

0

answers

7

views

Prove that 𝑔(𝑥) attains an absolute minimum at a 𝑐, with 𝑎<𝑐<𝑏

riemann-integration

asked 23 mins ago Henry Ng 57

-1

votes

0

answers

14

views

Volume of rotating around the $x$-axis

calculus integration definite-integrals volume

modified 25 mins ago gt6989b 50k

0

votes

0

answers

4

views

Let $K$ be a nonempty closed, convex subset of $R^d$. Prove that if $x\in K$, then there exists a unique point $y\in K$ that is closest to $x$.

real-analysis analysis supremum-and-infimum

asked 25 mins ago Housefire 203

0

votes

0

answers

17

views

Can this integral be bounded as such?

harmonic-analysis

modified 26 mins ago PhysMath 1,313

0

votes

0

answers

8

views

Homotopy Notation

general-topology homotopy-theory

asked 26 mins ago Emily Burkenhamen 121

0

votes

1

answer

21

views

If X is infinite and $x_0$ ∈ X , then X - {$x_0$} is still infinite proof

elementary-set-theory

answered 27 mins ago Brian M. Scott 565k

1

vote

0

answers

18

views

Is $X＋Y＋XY$ and $X＋Y-XY$ is isomorphic formal group law over integer ring?

power-series formal-power-series formal-groups

modified 28 mins ago Chickenmancer 3,818

1

vote

1

answer

9

views

Stewart's Theorem and Medians

geometry euclidean-geometry analytic-geometry

answered 28 mins ago Steve Kass 13.5k

0

votes

0

answers

4

views

Constraints for an interpolating quintic polynomial to be monotonic?

polynomials reference-request interpolation

asked 31 mins ago Ted Ersek 1,121

3

votes

1

answer

14

views

Is there an explicit equivalence of categories between real and complex commutative unital C* algebras

functional-analysis category-theory

answered 35 mins ago Ruy 11k

0

votes

0

answers

7

views

Second Bianchi identity on tangent bundle

differential-geometry vector-bundles curvature connections tangent-bundle

asked 36 mins ago GK1202 401

2

votes

1

answer

50

views

Alternative proofs that square root is irrational function

algebra-precalculus polynomials proof-writing solution-verification rational-functions

modified 38 mins ago lone student 5,116

0

votes

0

answers

9

views

Does this identity of summations hold true if the upper bound is infinity?

summation

asked 38 mins ago Rodentman87 101

0

votes

0

answers

7

views

Let $ G $ be a connected graph $ a \in A (G) $, they are equivalent

discrete-mathematics graph-theory trees

asked 39 mins ago Kitty M. 117

3

votes

1

answer

78

views

Q and R selection problem in LQI design

linear-algebra matlab control-theory optimal-control

modified 42 mins ago Peter Hirt 33

0

votes

0

answers

10

views

let $F\subset C(X)$ where C(X) are continuous functions on the compact interval $X$. Show that F is equicontinuous

real-analysis compactness equicontinuity

modified 47 mins ago ShanOH 386

0

votes

1

answer

27

views

How does changing Fourier coefficients affect a function's $L^1$ norm?

fourier-analysis harmonic-analysis

modified 49 mins ago PhysMath 1,313

0

votes

0

answers

8

views

Comparing two right continuous functions

real-analysis sequences-and-series functions inequality continuity

asked 52 mins ago Math Enthu 21

0

votes

0

answers

4

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Error comparison between two non-linear lines

analysis statistics

asked 55 mins ago hollowhills 1

0

votes

1

answer

21

views

Unit sphere of a subspace of a complex Hilbert space

real-analysis general-topology functional-analysis

answered 58 mins ago Kavi Rama Murthy 255k

0

votes

0

answers

13

views

What is the chromatic number?

combinatorics

asked 1 hour ago noname 3

0

votes

0

answers

35

views

How do you prove that f is 1-1, and then explain why it is also onto?

discrete-mathematics functions elementary-set-theory proof-explanation

modified 1 hour ago Haydn Gwyn 350

1

vote

1

answer

10

views

Markov Chain - Absorption

markov-chains

answered 1 hour ago Gregory 2,299

0

votes

1

answer

17

views

Show that $A$ satisfies all the axioms to be a commutative ring with unity.

abstract-algebra ring-theory

modified 1 hour ago Arturo Magidin 328k

1

vote

0

answers

17

views

Find all the vectors in $\mathbb{R}^2$ that are orthogonal to the vector $(1,-1)$

linear-algebra solution-verification vectors

asked 1 hour ago user926356 765

0

votes

0

answers

25

views

Is a measurable space a kind of Topological space?

general-topology measure-theory

asked 1 hour ago manav 31

1

vote

2

answers

16

views

How to analyze the following ODE with 2 variables

ordinary-differential-equations

answered 1 hour ago Aryadeva 32.1k

3

votes

0

answers

37

views

Finding inertia degree and ramification index over local fields

number-theory galois-theory algebraic-number-theory p-adic-number-theory

modified 1 hour ago fairly local 31

-1

votes

0

answers

20

views

How to go about solving this sum of a series problem?

sequences-and-series discrete-mathematics summation

asked 1 hour ago Broadsword93 565

0

votes

2

answers

18

views

Let T be an arbitrary tree. Prove that there is an ordering on the vertices as in Part 1.

combinatorics graph-theory

modified 1 hour ago 光復香港時代革命 Free Hong Kong 382

1

vote

1

answer

26

views

Angles determining a point interior to a triangle

geometry trigonometry triangles

answered 1 hour ago Jean Marie 53.7k

0

votes

0

answers

11

views

Does a series solution to a transcedental equation always converge or can it diverge?

sequences-and-series convergence-divergence divergent-series transcendental-equations

asked 1 hour ago Erich 193

0

votes

0

answers

5

views

Flat and general holomorphic sections of the induced representation $\operatorname{Ind}^{\operatorname{GL}_2}$

representation-theory p-adic-number-theory reductive-groups

asked 1 hour ago D_S 25.5k

0

votes

1

answer

24

views

$f(x)=(x-1)^b\ln(x)$, what is the $(b+1)^{th}$ derivative?

calculus derivatives taylor-expansion

answered 1 hour ago Robert Israel 403k

0

votes

0

answers

13

views

Solving the “Water Jug Problem” using Dynamic Programming

operations-research dynamic-programming

asked 1 hour ago MathEntrepeneur100 53

1

vote

0

answers

24

views

Final step in Hatcher's construction of the Serre spectral sequence for homology

algebraic-topology homology-cohomology spectral-sequences

modified 1 hour ago Daniel Gratzer 302

0

votes

0

answers

6

views

Applications of Balanced geometric shapes/sets?

geometry symmetry

asked 1 hour ago PythonMan1029 23

0

votes

1

answer

10

views

A system of nonlinear equation with sign function

inequality linear-programming nonlinear-system

answered 1 hour ago RobPratt 23.2k

1

vote

0

answers

15

views

finding p-norms on lebesgue measurable sequence of functions

lebesgue-integral lebesgue-measure norm lp-spaces sequence-of-function

modified 1 hour ago sandy 23

1

vote

1

answer

14

views

Proving that an expression is zero for all continuous complex valued functions on $[0,1]$

integration functional-analysis spectral-theory

modified 1 hour ago NN2 4,196

1

vote

1

answer

31

views

What is the geometric proof for the Cartesian formula of the gradient

geometry vector-analysis

answered 1 hour ago Andrew D. Hwang 59.4k

0

votes

0

answers

4

views

Prove that for any partition 𝑃 of [𝑎,𝑏], 𝐿(f𝑏,𝑃)=0.

riemann-integration upper-lower-bounds

asked 1 hour ago Henry Ng 57

0

votes

0

answers

5

views

Controlling supremum during weak convergence in Sobolev spaces

real-analysis functional-analysis partial-differential-equations sobolev-spaces

modified 1 hour ago warm_fish 781

0

votes

0

answers

15

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Follow-up to a Question on Differentiability of an Atomic Function

real-analysis analysis measure-theory lebesgue-measure special-functions

modified 1 hour ago Matematleta 24.7k

0

votes

1

answer

18

views

Generalizing Carathéodory's theorem to countable convex combinations.

convex-analysis

modified 1 hour ago Mathew 1,822

0

votes

0

answers

7

views

Number of trials needed to reach a probability P of a randomly thrown ball landing in each of four buckets, with constant success rate Q.

probability

asked 2 hours ago JohnnyGuitar 1

1

vote

0

answers

15

views

What is the technique for finding the shortest path between two points on a graph, given a constraint on the longest arc in the path?

graph-theory dynamic-programming

modified 2 hours ago Hisham Malik 11

0

votes

0

answers

4

views

branching process distribution

probability-theory measure-theory

asked 2 hours ago manav 31

0

votes

0

answers

23

views

A question of normal extension?

abstract-algebra galois-theory extension-field

modified 2 hours ago user158796 535

9

votes

1

answer

164

views

+100

Evaluate alternatively $\int_0^{\frac{\pi}{2}}\operatorname{Li}_2\left(\pm\sin^4x\right)dx$

definite-integrals special-functions

modified 2 hours ago Yuri Negometyanov 21.8k

0

votes

0

answers

17

views

Lebesgue Integrability of $(\sin x)^p(\cos x)^q$ on $[0,\pi /2]$

real-analysis integration trigonometry lebesgue-integral

asked 2 hours ago Gabi23 901

0

votes

0

answers

16

views

On the length of a curve in polar coordinates.

calculus integration arc-length

asked 2 hours ago Yassir 1,426

6

votes

3

answers

147

views

Cubic equation with circle intersection to form a square

geometry polynomials complex-numbers roots

modified 2 hours ago Jean Marie 53.7k

0

votes

1

answer

39

views

$l^2:=\{x=(x_1,x_2,\dots,x_n,\dots)|x_1,x_2,\dots,x_n,\dots\in\mathbb{R},\sum_{k=1}^\infty x_k^2<\infty\}$ is separable.

general-topology metric-spaces separable-spaces

answered 2 hours ago Henno Brandsma 197k

2

votes

2

answers

21

views

Finding a generator function of a linear homogenous recursion and its general expression

real-analysis sequences-and-series power-series recursion recursive-algorithms

modified 2 hours ago David 21

0

votes

0

answers

9

views

Help understanding the quaternion based Madgwick filter derivation

matrices complex-numbers vectors quaternions filters

modified 2 hours ago Nikola Ristic 21

0

votes

2

answers

26

views

$f(x)=x^2 \cos(x^5)+x^5 \sin(x^3)$, differentiate

calculus functions derivatives

modified 2 hours ago hamam_Abdallah 57.1k

1

vote

1

answer

17

views

Multiplying disjoint cycles

permutations permutation-cycles

answered 2 hours ago Théophile 24.9k

2

votes

0

answers

31

views

Solution of $T(n)=2T(n/2)+\log(\log n))$

asymptotics recurrence-relations

modified 2 hours ago Thomas Andrews 146k

0

votes

2

answers

38

views

What does determinants represents in general?

matrices determinant

modified 2 hours ago J. W. Tanner 54.8k

2

votes

2

answers

35

views

Conjunction not expressible as conditional

logic propositional-calculus

modified 2 hours ago Rob Arthan 38k

0

votes

0

answers

14

views

Second order stochastic linear inhomogeneous ODE with characteristic function

ordinary-differential-equations stochastic-processes brownian-motion finance stochastic-differential-equations

asked 2 hours ago Luca Gi 43

0

votes

0

answers

10

views

First integrals for topologically conjugate systems

ordinary-differential-equations dynamical-systems

asked 2 hours ago Azamat Bagatov 404

0

votes

0

answers

13

views

Equality for Riemann integrals

calculus integration normed-spaces riemann-integration cauchy-schwarz-inequality

asked 2 hours ago M.Martinez 67

0

votes

0

answers

14

views

Example Domains that Break the Segment Property

differential-geometry partial-differential-equations sobolev-spaces

modified 3 hours ago mathishard.butweloveit 315

0

votes

0

answers

9

views

Discrete to continuum: differentiating a summation and finding its maxima

summation maxima-minima

asked 3 hours ago lineage 256

0

votes

0

answers

7

views

Stokes flow for a falling sphere

applications fluid-dynamics

modified 3 hours ago wrb98 1,297

0

votes

1

answer

47

views

Show that $\{ v : \langle v, v\rangle > 0$ is a subspace of $V$

linear-algebra vector-spaces inner-products

modified 3 hours ago Xander Henderson♦ 21.6k

0

votes

0

answers

4

views

Regarding a simple Clarification on $x_{n-m}$ of Volterra series.

sequences-and-series finite-fields bounded-variation

asked 3 hours ago Samantha 303

7

votes

0

answers

148

views

+50

How far can the convergence of Taylor series be extended?

summation taylor-expansion riemann-zeta divergent-series

modified 3 hours ago Caleb Briggs 321

1

vote

0

answers

63

views

+100

Equational identities of the $(+,*,0,1)$ reducts of commutative rings

ring-theory universal-algebra

modified 3 hours ago user107952 9,208

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