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Interesting 44 Bountied Hot Week Month
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0 answers
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Is there an algebraic number which can be constructed from radicals, but whose $n$-th powers are never rational?

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user107952
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0 answers
6 views

Second derivative = 0 at turning point (0,0) for y = {x^5}-{5x^4}

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Nimna De Silva
  • 123
0 votes
0 answers
20 views

Statistics to detect employee/customer collusion

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LarryW
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0 votes
1 answer
26 views

Is the dimension of a valuation ring equal to the rank of its value group?

Alex Mathers's user avatar
Alex Mathers
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0 votes
1 answer
34 views

How to find the lengths of a similar triangle

KDP's user avatar
KDP
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9 votes
2 answers
332 views

Smooth map between oriented manifolds.

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Jean-Armand Moroni
  • 5,206
0 votes
0 answers
9 views

Calculating homology groups of a mapping cone

timothy's user avatar
timothy
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-1 votes
0 answers
20 views

Find divisor of a fraction

Alma Arjuna's user avatar
Alma Arjuna
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1 vote
0 answers
16 views

For which values of $\alpha \in \mathbb{R}$ does $\sum_{n=1}^{\infty}n^\alpha \left (\frac{1}{\sqrt{n}}-\frac{1}{\sqrt{n+1}} \right )$ converge

Jacob Walker's user avatar
Jacob Walker
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0 votes
0 answers
5 views

Lebesgue differentiation theorem extended for surface integrals

Sam's user avatar
Sam
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1 vote
1 answer
35 views

Prove that $\sum_{i=0}^{\lfloor n/2 \rfloor }\sum_{j=0}^{\lfloor n/2 \rfloor-i}{n \choose 2i}{n-2i \choose 2j}2^{n-2i-2j}=4^{n-1}+2^{n-1}$

Marko Riedel's user avatar
Marko Riedel
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0 answers
6 views

Summation Theorem Derivative

hanamontana's user avatar
hanamontana
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1 vote
0 answers
19 views

Cartesian products in categories of subobjects

Bruno's user avatar
Bruno
  • 71
0 votes
0 answers
4 views

Two Timing (Multiple Time Scales) with Coupled IVPs

Sanket Biswas's user avatar
Sanket Biswas
  • 3,853
0 votes
0 answers
58 views

Extracting coefficients with the power series $(1-x)^{-n}$

Older Amateur's user avatar
Older Amateur
  • 94
3 votes
0 answers
102 views

$\lim\limits_{x\to+\infty}\sum_{k=0}^\infty \left[\lambda f\left(\frac{x}{2^k}\right)-f\left(\frac{x}{3\cdot 2^k}\right)\right]$?

tripaloski's user avatar
tripaloski
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2 votes
0 answers
34 views

Why is this approximate solution correct?

user655870's user avatar
user655870
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0 answers
15 views

How to calculate the area of a region enclosed by the following curve

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青山漫步
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0 votes
1 answer
24 views

Prove that $T$ is not compact but $T^2$ is compact operator

Michh's user avatar
Michh
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0 votes
1 answer
28 views

For an arbitrary continuous curve $\gamma:[0,1]\to\mathbb R^n$, does the Riemann-Stieltjes integral $\int_0^1\gamma(t)\wedge d\gamma(t)$ exist?

mr_e_man's user avatar
mr_e_man
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1 vote
1 answer
34 views

Derivative of $X(X^\top X)^{-1/2}$ with respect to the matrix X

greg's user avatar
greg
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0 votes
0 answers
68 views

I need help with this question.

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Theoldsoul
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0 votes
0 answers
12 views

Comparing Elements of an Ideal in Different Module Structures

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yoyok3
  • 25
0 votes
1 answer
47 views

probability distribution of total number of cells with 1/2 probability of dividing.

Voyager's user avatar
Voyager
  • 103
0 votes
0 answers
27 views

If $\varphi|_W$ and $\bar{\phi}$ are nonsingular prove that $\varphi$ is nonsingular.

Secretly's user avatar
Secretly
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-1 votes
0 answers
17 views

Can someone please help me with this proof? I first tried to prove x-b<=0 but it seems like not possible to prove directly

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Bill Dubuque
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0 votes
0 answers
8 views

Given $n$ uniform random variables, probability no two differ by less than $x$

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Bertrand Einstein IV
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0 answers
5 views

Convex optimization dual problem solution

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bikeactuary
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0 answers
7 views

Find two edge-disjoint spanning trees in $H_4$, the 4-dimensional hypercube. Draw $H_4$ and the trees.

Aamir Hussain's user avatar
Aamir Hussain
  • 1
2 votes
3 answers
36 views

Why is y=In x the only logarithmic function with a gradient 1 at x=1?

Joshua Tilley's user avatar
Joshua Tilley
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0 votes
0 answers
81 views

Does $P$ get minimum $\sqrt{a(2b+1)}+\sqrt{b(2c+1)}+\sqrt{c(2a+1)}$?

Anonymous's user avatar
Anonymous
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0 votes
1 answer
27 views

Techniques of Intergration - Trig Intergrals Help

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user317176
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0 answers
7 views

Finding the break even point between two fee structure

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Dhruv Nair
  • 1
1 vote
0 answers
22 views

Symplectic area is invariant under homotopy

subrosar's user avatar
subrosar
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0 votes
0 answers
21 views

Finding optimal way to pay a set of credit cards

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rudytheduck
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0 votes
0 answers
18 views

Find a basis and dimension

QuantumSuperfield's user avatar
QuantumSuperfield
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0 answers
83 views
+100

Optimize $\sqrt{a^2+5bc}+\sqrt{b^2+5ca}+\sqrt{c^2+5ab}\ge \sqrt{a^2+b^2+c^2+17(ab+bc+ca)}.$

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Anonymous
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1 vote
0 answers
5 views

Embedding space of rational functions into projective space

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Maths Matador
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0 answers
10 views

Making a Geocentric Model of the Solar System Using Trigonometry

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Curtis Sheppard
  • 252
1 vote
0 answers
11 views

Differentiable function satisfying $x \cdot \nabla f(x) = 0$

GodelEscher's user avatar
GodelEscher
  • 306
0 votes
1 answer
26 views

Using cylindrical coordinates to solve volume of revolution question

Cye Waldman's user avatar
Cye Waldman
  • 6,953
1 vote
2 answers
55 views

Condition on the inequality holds asymptotically

River Li's user avatar
River Li
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0 votes
1 answer
26 views

Show property for a real valued function $f:\mathbb{R^n}-\{0\}\to\mathbb{R}$ satisfying certain constraint

Feng's user avatar
Feng
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0 votes
0 answers
27 views

Leading digits of the iterated powers of 2

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Robert Barg
  • 149
0 votes
1 answer
33 views

Number of injective functions between sets

Tom's user avatar
Tom
  • 335
0 votes
0 answers
40 views

A problem about covering space in Munkres. Why the elements in the neighborhood can only has exactly $k$ preimages.

M_k's user avatar
M_k
  • 1,727
0 votes
0 answers
8 views

Bound from below the probability to go beyond a certain point in a zero mean random walk

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Luca Onnis
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0 answers
5 views

Requirements for convexity of isolated minima

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AMAteur
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0 votes
1 answer
15 views

Applying the integral identity for reciprocal of the difference of squares sqrted

Greg Martin's user avatar
Greg Martin
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2 votes
1 answer
41 views

Existence of optimal code (Proof)

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stochasticboy321
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5 votes
0 answers
21 views

A question on commutative diagram of abelian groups

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integeraddict
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2 votes
1 answer
19 views

For an arbitrary continuous function $f$, is the Stieltjes integral $\int_0^1(df(x))^3=0$?

mr_e_man's user avatar
mr_e_man
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2 votes
0 answers
52 views

Limes inferior of differentiable function

Alex Ortiz's user avatar
Alex Ortiz
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0 votes
0 answers
38 views

Recursive Expectation Question

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PerplexedPelican
  • 19
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0 answers
20 views

Chebyshev's inequality for sum of dependent random variables

Michh's user avatar
Michh
  • 2,541
1 vote
0 answers
53 views

Powers of real numbers in a series

delta_99's user avatar
delta_99
  • 67
-1 votes
0 answers
8 views

Bijective and bounded of inverse of bounded linear operator

Hermi's user avatar
Hermi
  • 1,422
0 votes
0 answers
8 views

Is Miura transformation invertible?

hyriusen's user avatar
hyriusen
  • 97
2 votes
1 answer
23 views

How to prove a result about the accumulation point / cluster point in Brownian Motion?

K. A. Buhr's user avatar
K. A. Buhr
  • 917
-1 votes
0 answers
21 views

Let $G = (V, E)$ be a bipartite graph. Show that we must have $|A| = |B|$

Alessandro's user avatar
Alessandro
  • 2,553
0 votes
0 answers
7 views

Need help derivation of Fourier Coefficient for inhomogeneous BCs

Researcher R's user avatar
Researcher R
  • 313
2 votes
1 answer
25 views

Cocompact action with finite stabilizer implies locally finite

Zackkenyon's user avatar
Zackkenyon
  • 642
0 votes
0 answers
44 views

Let $\mathbb Z[x]$ denote the set of all polynomials of the variable

Anne Bauval's user avatar
Anne Bauval
  • 29.5k
1 vote
1 answer
40 views

Factoring a partially antisymmetric polynomial

Martin Brandenburg's user avatar
Martin Brandenburg
  • 159k
0 votes
0 answers
29 views

Is my reasoning right about and extreneous root?

Bill Dubuque's user avatar
Bill Dubuque
  • 269k
2 votes
1 answer
39 views

There exists a unique stable limit cycle around $(0,0)$

Hermi's user avatar
Hermi
  • 1,422
0 votes
0 answers
13 views

why is the dual of abelian discrete group the collection of irreducible representations of $G$ on the Hilbert space $\mathbb{C}$

3j iwiojr3's user avatar
3j iwiojr3
  • 415
-1 votes
0 answers
19 views

Is there any analytical solutions to this integral?

Mehdi's user avatar
Mehdi
  • 27
4 votes
1 answer
53 views

Scalar integrals in higher dimensions

Ted Shifrin's user avatar
Ted Shifrin
  • 112k
0 votes
0 answers
14 views

Rule for manipulating differential 2-forms in a physics derivation

User198's user avatar
User198
  • 46
0 votes
1 answer
28 views

Is the affine special linear group perfect?

Ian Gershon Teixeira's user avatar
Ian Gershon Teixeira
  • 7,168
0 votes
1 answer
29 views

About upper asymptotic density.

Greg Martin's user avatar
Greg Martin
  • 75.2k
0 votes
0 answers
17 views

finding basic solutions to a system of equations

MATHich's user avatar
MATHich
  • 1
1 vote
0 answers
39 views

$ SO(4) \supset SU(2)? $

zeta's user avatar
zeta
  • 49
0 votes
0 answers
34 views

Prove that $S^1$ has a nowhere vanishing vector field.

user1180312's user avatar
user1180312
  • 35
0 votes
0 answers
11 views

Deviation with respect of the Mode, part 2 - Weighted linear combination

Joako's user avatar
Joako
  • 1,256
0 votes
0 answers
9 views

Does the power method work for finding the dominant eigenvalue of matrixes if the original matrix has only 1 eigenvalue?

littledumbdumb's user avatar
littledumbdumb
  • 1
0 votes
0 answers
16 views

Inscribed circle $O_1$ is tangent to outer circle and its secant AB. Prove the circumcircle of the triangle $ABO_1$ bisects segment of tangent points.

r ne's user avatar
r ne
  • 782
2 votes
1 answer
42 views

Understanding the Likelihood Principle - What is the Big Deal here?

K. A. Buhr's user avatar
K. A. Buhr
  • 917
0 votes
1 answer
13 views

Given bivariate bernoulli with an integral as a parameter prove that are marginally identically distributed and correlation is positive

leonbloy's user avatar
leonbloy
  • 62k
2 votes
0 answers
14 views

Intersection multiplicities of varieties expressed with curves

quantum's user avatar
quantum
  • 1,605
1 vote
0 answers
12 views

Will this attempt to mathematically formalize the Burrows Wheeler Transform (BWT) let us define generalizations or variations of it?

mathreadler's user avatar
mathreadler
  • 25.6k
68 votes
2 answers
3k views

Evaluating $\sum\limits_{x=2}^\infty \frac{1}{!x}$ in exact form.

DragonDoesMath283's user avatar
DragonDoesMath283
  • 1
1 vote
1 answer
23 views

Frobenius automorphism for abelian/non abelian number fields extension

Lukas Heger's user avatar
Lukas Heger
  • 19.9k
0 votes
0 answers
20 views

Circular Table - Probability of Biased Coin

Jack 625's user avatar
Jack 625
  • 59
2 votes
0 answers
13 views

Computing $E[\|ABB^TA^T\|_F^2]$ for Gaussian $A,B$

Yaroslav Bulatov's user avatar
Yaroslav Bulatov
  • 4,903
2 votes
2 answers
457 views

Abel's Summation (memorizing the theorem)

Masacroso's user avatar
Masacroso
  • 29.8k
0 votes
0 answers
12 views

P(X=Y) for jointly cumulative probability distribution function

Maria Cruz's user avatar
Maria Cruz
  • 1
0 votes
0 answers
25 views

Need an Example of Two Composite Isometries $F_1 ∘ F_2$ that May Not Be Used Interchangeably

amadecember's user avatar
amadecember
  • 13
0 votes
1 answer
41 views

Quadratic Formula: Any Shortcomings?

Robert Israel's user avatar
Robert Israel
  • 440k
6 votes
5 answers
218 views

How to integrate $I = \int_{0}^{\infty} \frac{e^{-x}\sin^4(x)}{x^{2}}\,dx$

Bob Dobbs's user avatar
Bob Dobbs
  • 8,584
0 votes
0 answers
14 views

$M$ is a continuous local martingale. Prove the consequences

timofiej8384's user avatar
timofiej8384
  • 167
0 votes
0 answers
18 views

Prove that the radical of an ideal is generated by the squarefree parts of its generating monomials.

Alex A.G.'s user avatar
Alex A.G.
  • 1
0 votes
0 answers
41 views

Actually verifying and understanding my proof that $Y\subseteq B_X(n)$ implies $B_Y(m)\subseteq B_X(mn)$

Shaun's user avatar
Shaun
  • 43.6k
1 vote
1 answer
27 views

Show that if all sub vectorspace are A-invariant, A must be scaled identity matrix

Carlyle's user avatar
Carlyle
  • 2,115
3 votes
0 answers
13 views

Show that $\xi X \mathbb 1_{(t_1,t_2]} \in \Lambda_T^2(W)$ and $\int_{t_1}^{t^2}\xi XdW=\xi \int_{t_1}^{t_2}XdW$

anatolij3253's user avatar
anatolij3253
  • 117
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