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2 votes
1 answer
37 views

How Do I Show this Differential is Surjective?

0 votes
1 answer
83 views
+50

Upper bound on $P(X \geq 100)$ if $g_X(10)=10$

0 votes
2 answers
26 views

If $g\circ f=f$ in a category, then is $g$ necessarily the identity morphism?

0 votes
1 answer
95 views

Finding intermediate fields of the extension $\mathbb{Q}=(\sqrt{3+\sqrt{7}},\sqrt{3-\sqrt{7}})/\mathbb{Q}(\sqrt{14})$

0 votes
0 answers
24 views

Size of pseudo cosets $kG$ for $k \geq 2$ and $G \leqslant \Bbb{Z}/d^{\times}$ for square-free $d$; relates twin primes to $2k$ prime gaps in general.

1 vote
0 answers
48 views

Compute the Characteristics of a PDE

0 votes
1 answer
2k views

Finding all composition series of $S_3 \times Z_2$

-1 votes
0 answers
20 views

Chain Role for Complex Wirtinger derivative

4 votes
1 answer
1k views

How to show that $\sqrt{5}$ is not in $\mathbb Q(\sqrt{2},\sqrt{3})$

0 votes
0 answers
10 views

Busy Beaver function in intuitionistic ZF

2 votes
1 answer
63 views

Evaluating a binomial sum with a probabilistic interpretation

3 votes
1 answer
148 views

Proof of Triangle Inequality for $d(g; x, y) = \left(|x-y|^4 + g\,| x \times y |^2\right)^{\frac{1}{4}}$

0 votes
0 answers
6 views

What changes in the 1st and 2nd variation formulas and the information contained in the index form for a Lorentzian instead of a riemannian manifold?

0 votes
0 answers
3 views

How to implement the 3D radon transform?

5 votes
2 answers
925 views

Difference between a Reduced Residue Class and a Reduced Residue System

0 votes
0 answers
8 views

What information does the sign of the index form gives me about the geodesic?

4 votes
0 answers
71 views
+50

Limit of $f:\mathbb{R}\to\mathbb{R}$ such that $f(x) = \frac1{q_n^5}$, if $x=\frac{p_n}{q_n}$ for $x \to \sqrt{2}$

0 votes
0 answers
6 views

Normal vector and inequality

0 votes
0 answers
10 views

Understanding a step of the proof in a probability paper

0 votes
1 answer
970 views

Linear Algebra Question: Change of Basis and Matrix Multiplication

1 vote
1 answer
100 views

An algebraic space over etale topology is also a fppf-sheaf?

0 votes
1 answer
44 views

prove that if $A^k =0$ then there is $v \in \mathbb{F}^{n}$ such that the group $\{v,vA,vA^2,\dots,vA^{k-1}\}$ is linearly independent in induction

-2 votes
0 answers
19 views

The sum of the digits of $2^{m}$ in base $2$

1 vote
0 answers
3 views

Committee of size k out of n couples selected, probability of exactly j couples in it. Introduction of probability's question

0 votes
0 answers
19 views

Complexity of entailment between equivalences of dual formulas

0 votes
0 answers
8 views

Let $R$ be a commut ring and $A,B,C$ be $R$-modules, $A$ finitely presented, $C$ flat. Then $\text{Hom}(A,B\otimes C)\cong\text{Hom}(A,B)\otimes C$

1 vote
1 answer
66 views

How to calculate definite integral of $e^{-\frac{y^2}{2}}$?

0 votes
1 answer
17 views

Conditional distribution of interarrival time of second arrival in Poisson process

0 votes
0 answers
21 views

Monotonic function on a closed and bounded interval with Unbounded Derivative

1 vote
0 answers
24 views

Let $R=\mathbb Z[X,Y]$. Find an exact sequence $0\to R\to R\oplus R \to R\xrightarrow{f} \mathbb Z \to 0$ with $f(g(x,y)) := g(0,0)$ for all $g \in R$

0 votes
0 answers
14 views

Why does a lack of inversion symmetry in 2D pattern formation lead to hexagons?

3 votes
5 answers
4k views

Solving a complex cubic equation

1 vote
1 answer
40 views

Closest Point With a Property in $L^2([0,1])$

5 votes
1 answer
100 views

Technical issue with empty metric space

1 vote
0 answers
38 views

How do I compute the eleventh roots of unity algebraically, expressed with only square roots and fifth roots?

3 votes
0 answers
17 views

Show that $\mathbb Q[t] \otimes_{\mathbb Q[t^2]} \mathbb Q[t] \cong \mathbb Q[x,y]/(x^2-y^2)$ (as $\mathbb Q$--algebras)

0 votes
2 answers
29 views

Finding any arbitrary integer point on a line with rational slope and intercept

0 votes
0 answers
18 views

Help proving a chain rule from total derivative chain rule

0 votes
1 answer
9 views

Existing irreducible elements infinitely in an infinite commutative domain with unit.

6 votes
1 answer
221 views

A question about prime numbers, totient function $ \phi(n) $ and sum of divisors function $ \sigma(n) $

2 votes
2 answers
189 views

Extension of a differentiable function $f$ to an open superset

1 vote
1 answer
16 views

Verifying Property of Constructed Brownian Motion using Haar Basis

2 votes
0 answers
36 views

In search of a model to describe worm behaviour

2 votes
1 answer
28 views

Unique Solution to the Heat Equation

2 votes
0 answers
29 views

Frullani's integral

0 votes
0 answers
21 views

Non existence of Continuous logarithm on $\mathbb{C}^*$

0 votes
0 answers
3 views

Factorizing $AMA^T+N=WW^T$ efficiently.

0 votes
0 answers
17 views

Logic behind contrapositive proofs that involves De Morgan's Laws

0 votes
0 answers
12 views

If $A^{\top}A<I$, does $A^{\top}PA<P$ hold for any positive-definite matrix P?

0 votes
0 answers
9 views

Showing an abstract surface (with a specific metric) is isometric to a helicoid

0 votes
1 answer
34 views

What are generic ideals and dense sets, intuitively?

-1 votes
0 answers
3 views

Significance level for 2 test statistic

0 votes
0 answers
99 views

Discrete math| tricky question | need help with the technique for similar questions

-1 votes
0 answers
12 views

What is the steady state of a Markov chain with two absorbing states?

0 votes
1 answer
45 views

Trigonometry problem (related to the one I asked a few days ago but with one small change that makes a big difference!

1 vote
1 answer
29 views

Non-cyclic numbers that are not the order of any capable group

1 vote
0 answers
17 views

Characterization for Caratheodory measurable set

4 votes
1 answer
70 views

Algebraic points on circles/solutions to $x^2+y^2=a$ over $\overline{\mathbb Q}$: is there a point with odd degree field extension over $\mathbb Q$?

0 votes
0 answers
17 views

Definition of Convolution of functions of two variables

-3 votes
0 answers
14 views

Prove that the given equation in the image is a boolean algebra.

0 votes
0 answers
15 views

Does the Annihilator for a differential equation have to be injective?

2 votes
1 answer
51 views

Failure of translation-invariance of an integral?

1 vote
1 answer
39 views

What does adding a little o mean in differentiability?

0 votes
1 answer
21 views

Is the weak topology in separable Sobolev spaces induced by a metric?

0 votes
0 answers
13 views

Existence and uniqueness of "minimal p-object"?

0 votes
1 answer
18 views

Defining the Y combinator in terms of S, K and I

0 votes
0 answers
22 views

Variation of Farkas’ Lemma

2 votes
1 answer
77 views

Asympotic behaviour of $\sum_{z \in \mathbb{Z}^d} (1+ \| x-z\|)^{2-d} (1+ \| y-z\|)^{2-d}$

-1 votes
0 answers
19 views

Upper Bound of a product of sines

0 votes
0 answers
42 views

On the number of $\sigma\in S_{p-1}$ of a given form.

0 votes
1 answer
65 views

Calculating $\int_{-\infty}^\infty |x| e^{(-|x|/a)^b} \,dx$

0 votes
0 answers
20 views

Question related to splitting of matrix

2 votes
1 answer
32 views

If the base function for the transformed function $f(x)= -4(3x)^2+5$ is $f(x)=x^2$, then: is $k=3$ or $k=9$?

1 vote
0 answers
13 views

Completes of an orthonormal set in a Hilbert space

1 vote
1 answer
37 views

Why is there no conditional inference rule in Sequent Calculus of these forms?

0 votes
0 answers
5 views

Inverse uncertain homography

-1 votes
0 answers
19 views

Probabilities for y succeeds in n trials.

-1 votes
0 answers
13 views

Prove that for some v that is a primitive root of some safe prime n = 2p+1 (p is also a prime), for all 0<= i < n-1, v^2i is not a primitive root of p

0 votes
0 answers
18 views

In convergence of adaptive algorithm, why we assume $|H(\theta, x)| \leq C_1(1 + |x|^{q_1})$?

0 votes
0 answers
19 views

Determine coordinates of functional in the dual basis of a given basis of $\mathbb{R}_{2}[x]$

0 votes
0 answers
13 views

Deriving and understanding the geometric meaning of the formula concerning Lie bracket and derivatives.

0 votes
0 answers
11 views

numerical range of Normal operator

0 votes
0 answers
7 views

Expected x-axis projection length corresponding to the y-value interval of the random polyline

0 votes
0 answers
9 views

Can a CL-term have multiple fixed points?

0 votes
0 answers
12 views

What is a good reference book for the topic "Approximation of Measurable Functions by Simple Functions" in measure theory?

0 votes
0 answers
12 views

Finding geodetic coordinates of the plane-ellipsoid intersection ellipse

0 votes
0 answers
12 views

Questions about compact metric space $X$ with finite probability measures with finite supremum.

0 votes
0 answers
4 views

Distance distribution of poisson points to nearest shape boundaries.

-1 votes
0 answers
21 views

How many unique unit squares do the 2 diagonals of rectangle of size 3x5? And nxm (where n and m are relatively prime)

3 votes
1 answer
47 views

Given $f(x)=x+\sin(x+\sin(x+\sin(x+\cdots)))$, how would I go about finding the value of $f(1)$ to $5$ decimal places?

4 votes
1 answer
91 views

The simplest curve which is never straight and has a rational arc length.

2 votes
0 answers
24 views

Finding a simple graph such that its automorhism group equals the subgroup of $S_3$ generated by a 3-cycle

0 votes
1 answer
42 views

The difference between convergence in probability and convergence in observed value

0 votes
0 answers
34 views

An attempt of solving the tangent map of left multiplication by $g$ on $GL(n,\mathbb{R})$ is also a left multiplication

0 votes
0 answers
6 views

KL divergence between two joint Laplace distributions

99 votes
18 answers
21k views

Can the golden ratio accurately be expressed in terms of $e$ and $\pi$

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