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2 views

Valuation and Sum of Digits

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0 answers
3 views

How long is the hypotenuse of an isosceles right angled triangle with side lengths 1?

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0 answers
11 views

Tangent problem involving orthocenter and circumcenter in a triangle

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1 answer
29 views

How do I find a formula for this sequence

2 votes
2 answers
28 views

Books on numerical integration

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0 answers
4 views

Diagonalization of quadratic forms and partial derivatives

2 votes
0 answers
13 views

Understanding the girth of trees

1 vote
2 answers
24 views

How does raising a complex number to n affect its principal argument

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0 answers
7 views

Fundamental group of a hatching

1 vote
1 answer
16 views

Inaccessible cardinals and consistency of ZFC

7 votes
3 answers
20k views

Vector space as direct sum of kernel and image

0 votes
1 answer
24 views

Social Distancing Problem

1 vote
1 answer
3k views

Statistics probability - finding the exact distribution of $X$

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0 answers
18 views

Study if the function $F(x)=\int_{0}^1D(xu)du$ is differentiable

0 votes
1 answer
56 views

Equivalence classes of $r_1 \exp(ix) = r_2 \exp(iy)$

2 votes
1 answer
89 views

$D$ inside $\triangle{ABC}$ such that $\angle{ABD}=\angle{CBD}=6^{\circ}$,$\angle{BCD}=12^{\circ}$,$\angle{ACD}=18^{\circ}$, find $\angle{BAD}$

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0 answers
42 views

Proof Integral inequality

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0 answers
11 views

How to find a matrix, characteristic and minimal polynomial of a linear operator?

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1 answer
16 views

Inverse discrete Lyapunov equation: given positive-definite $P > Q > 0$, what is $A$ when $A^TPA - P = -Q$

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0 answers
13 views

Expected value of mean reverting spot price - triple numerical integral

1 vote
0 answers
284 views

Are anti-linear/semi-linear maps, such as conjugations, linear in other almost complex structures?

0 votes
2 answers
44 views

Find the value of $ \prod_{k=0}^{n} \frac{\left( \left( \cot x \right)^{2^k} + 1 \right)^2}{\left( \left( \cot x \right)^{2^{k+1}} + 1 \right)}$

2 votes
1 answer
27 views

If $B \supseteq A$ are unitary commutative rings, $B$ is Noetherian, and there exists an $A$-linear retraction $r: B \to A$, then is $A$ Noetherian?

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0 answers
23 views

Expressing $\prod_{n=1}^{\infty}\left(1-\frac{x}{n^{2}}\right)$ as an elementary function

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0 answers
23 views

Why duality formula holds for L^2

-1 votes
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9 views

The center of prime ring

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0 answers
6 views

Constructing a product on vectors that satisfy some axioms

1 vote
1 answer
31 views

Is there always a sequential nature of time-stepping?

-2 votes
0 answers
11 views

3. Find the fourier series expansion for f(x)= 2, if - 2 <= x < 0 \\ x,if 0<x<2

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0 answers
37 views

Solving system of equation

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0 answers
6 views

bv space is a direct sum of $bv_0$ with a one dimensional subspace

2 votes
2 answers
24 views

A game requires 2 players opposite 2 other players, with 6 people available, how many distinct games can take place?

6 votes
0 answers
126 views

A remarkable fact about the unit circle; looking for a shape with an even more remarkable fact.

3 votes
1 answer
28 views

Fubini-Study metric/form

-1 votes
1 answer
24 views

Calculating a pullback function where the map has an extra dimension compared to the covector field

1 vote
2 answers
1k views

Prove symmetry of probabilities given random variables are iid and have continuous cdf

0 votes
1 answer
26 views

A sequence question, relating the Jacobsthal to the Fibonacci sequence.

3 votes
1 answer
20 views

Can we build multiple models of PA within one the same model of ZFC?

3 votes
1 answer
58 views

Stable categories are tensored over spectra

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0 answers
6 views

annihilating ideal of quotient rings of polynomial rings.

0 votes
0 answers
11 views

Could you please recommend some solutions manual about PDE?

1 vote
0 answers
29 views

Maximal value of $\sum_{n=1}^N z^T X(P_n X + I)^{-1}z$ over positive semidefinite cone?

0 votes
0 answers
10 views

Medians from rows of numbers

3 votes
1 answer
38 views

A coin game - is it a group?

4 votes
1 answer
63 views

Connected components of $\{ g\in \mathrm{GL}(2n,\mathbb{R})\mid g^2=(-I)\}$

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0 answers
10 views

Group actions on functions induced by group actions on their domain

1 vote
1 answer
245 views

Find a maximum-weight matching in general graph with constrained cardinality

0 votes
1 answer
12 views

Every planar graph with no cycles of length $3,4,5$ is $3$-colorable.

2 votes
0 answers
49 views
+100

Calculate $\sum_{n=1}^\infty (1-\alpha) \alpha^nP^{*n}(x)$

1 vote
0 answers
34 views
+100

Ideal of multivariate polynomial

1 vote
0 answers
14 views

Different bases of vector spaces of symmetric polynomials

1 vote
1 answer
27 views

What function can model a decay, whose linear slope smoothly changes around a certain x value.

3 votes
4 answers
127 views

The limit of $\frac{a^n}{(1+a)(1+a^2) \ldots (1+a^n)}$ $a>0$

0 votes
1 answer
40 views

What Mathematical Structure can be used for this Optmisation Problem

0 votes
1 answer
16 views

Search for a general solution for a hyperbolic equation with a boundary condition on a sphere

3 votes
1 answer
1k views

maximal principle uniform covering of a sphere with uniform geodesics

5 votes
1 answer
66 views

Convergence of Step Functions Generated by Uniformly Distributed Random Points

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0 answers
17 views

$X\setminus \overline{\{ x\}}$ is meet irreducible in the lattice $O(X)$.

0 votes
0 answers
8 views

finite diffrence scheme in two dimension

3 votes
1 answer
35 views

Mach equation algebraic manipulation

0 votes
0 answers
11 views

Maximum number of edges in a graph on 20 vertices with no triangles

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0 answers
26 views

Contraction by a form on the definition of Hermitian-Einstein metric

1 vote
0 answers
55 views

Reference for unknown notion related to continuity

1 vote
1 answer
60 views

What can I say about $P(B|A_1 \cap A_2)$ if I know that $P(B|A_1), P(B|A_2) \approx 1$?

0 votes
0 answers
8 views

Understanding the transpose of a (generalized) Calderon-Zygmund operator

1 vote
0 answers
58 views

Multiplicative group of $\frac{\mathbb{Z}_n[x]}{(f(x))}$ where $n$ is a product of 2 primes

0 votes
0 answers
36 views

How do I calculate an orthonormal basis, with zero-valued second fundamental form, of a smooth parametric surface at any given point?

0 votes
0 answers
7 views

Hidden Markov with both discrete and continuous states

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0 answers
11 views

Item selection probablity after sampling m items out of k and then sampling two item from the m items uniformly.

0 votes
0 answers
18 views

Solution of linear dynamical systems without Fourier transforming.

1 vote
0 answers
39 views

Solving the system $a^x=(x+y+z)^y$, $a^y=(x+y+z)^z$, $a^z=(x+y+z)^x$, for $x$, $y$, $z$

-1 votes
0 answers
22 views

Find all $\alpha, \beta, \gamma$ such that $(C_{2^n}^n)^{\frac1n}\sim\alpha n^{\beta} \gamma^{n}$

2 votes
0 answers
54 views

What's the value of $\int \frac{f''(x)}{f(x)} dx$?

4 votes
3 answers
98 views

Concrete examples of internal categories (other than small categories)

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0 answers
17 views

Examples of vertex & edge Lipschitz functions

1 vote
0 answers
27 views

Prove the following result on continuity.

2 votes
0 answers
45 views

Questions on integrating $\int_0^{\infty} \frac{x^{\frac{1}{3}}}{1 + x^2} dx$ using contour integrals

2 votes
0 answers
23 views

Distribution of sum of two uniformly distributed variables under addition modulo

3 votes
0 answers
1k views

Mobius band does not retract to boundary circle - specific part

1 vote
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34 views

Shapes with simple distance functions.

1 vote
1 answer
15 views

Can probe trajectories to compute Lyapunov exponents get "stuck in more regular orbits" after rescaling?

9 votes
3 answers
5k views

Every retraction is a quotient map?

1 vote
0 answers
45 views

Caratheodory therem

6 votes
2 answers
628 views

If $\psi=x\sin(\frac{1}{x})$, and $f$ is integrable, is then $f\circ \psi$ also integrable?

2 votes
0 answers
48 views

Elementary functions: Can an arithmetic operation be a composition?

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0 answers
27 views

Is this a typo in Fulton and Harris?

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0 answers
4 views

How do I apply the shooting method to a BVP with Robin's mixed condition in $t_0$ and $T$?

0 votes
0 answers
9 views

Similarity between variation and differential

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0 answers
12 views

Finding constant for asymptotic equality

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7 views

Permutation matrix as sum of orthogonal unit vectors

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45 views

Linear independence of elements in $\mathbb F_5^3$

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13 views

Product of Laplace-Beltrami eigenfunctions

0 votes
0 answers
27 views

Commutator Ideal of Non commutative ring

3 votes
1 answer
26 views

Can we construct regular icosahedron dice with constant full-face sum?

2 votes
1 answer
69 views

Doubt about Bulirsch's proof for Cholesky decomposition.

2 votes
1 answer
57 views

Find out information about an ODE without actually computing the solution

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