Skip to main content

Explore our questions

0 votes
0 answers
13 views

If $\varphi(f)$ is Riemann integrable for each $\varphi \in E^*$, then is $f$ Riemann integrable?

0 votes
0 answers
13 views

How many vertices does $(\Bbb{T}^2)^{\#g}$ have?

4 votes
4 answers
667 views

On the proof of Buckingham π theorem

0 votes
0 answers
7 views

Applying Leibniz's Rule to Double Integrals with Variable Limits

3 votes
4 answers
226 views

How to find the maximum length of chord cut by a right angle inside a circle

0 votes
0 answers
3 views

Conditions for a Fourier-windowed quadratic form to define a finite-range or exponentially decaying interaction?

0 votes
0 answers
13 views

Changing the order of integration in an iterated integral with a single varible function

3 votes
1 answer
895 views

Multinomial Distribution to Binomial Distribution and Joint Probability Function

0 votes
0 answers
11 views

Restrictions of Knight's Tour on Circular Board

5 votes
4 answers
326 views

If $a^2+b^2+c^2=1$ so $\sum\limits_{cyc}\frac{1}{(1-ab)^2}\leq\frac{27}{4}$

0 votes
0 answers
58 views

Example of the $\mathrm{dim}A > \mathrm{depth}A$

1 vote
1 answer
29 views

Any 'locally butterfly' graph be constructed as line graph from a 3-regular, triangle-free graph: Can this be generalized to locally windmill graphs?

5 votes
1 answer
97 views

Quintic residues and $p=x^2+125y^2$

3 votes
3 answers
145 views

Complex logarithm base 1

0 votes
1 answer
1k views

Solving $\sin(x) + \sin\left(2^{(n+12)/12}x\right) = \sin(x+w) + \sin\left(2^{(n+12)/12}(x+w)\right)$ for $w$

2 votes
1 answer
50 views

Simplify expression for lemniscate tangent function

0 votes
0 answers
18 views

a complete theory in a countable language with countably many types but uncountably many countable models

1 vote
1 answer
799 views

Jensen inequality for concave functions

0 votes
0 answers
7 views

The set $\mathcal{S}(R)$ of all radical ideals of a ring $R$ might form a boolean ring with $\circ=$ ideal addition and $\oplus=$ a certain quotient.

2 votes
1 answer
97 views

Reversibility of a random walk

1 vote
1 answer
48 views

Possible arrangements for any n number of distinct cubes

2 votes
1 answer
757 views

Element with maximum magnitude in $A \leq \max(\sigma_{i})$, where $\sigma_{i}$ is singular values of A

0 votes
0 answers
14 views

Seeking resources about multiple directed acyclic graphs/topological orderings

2 votes
1 answer
135 views

Is my understanding correct about the inverse relationship between derivatives and integrals?

2 votes
0 answers
17 views

Chern class of tangent bundle of hypersurface of CP^n viewed as complex of coherent sheaves

0 votes
0 answers
106 views

Why do vectors behave as derivation on functions

1 vote
1 answer
787 views

Number Plate Problem

4 votes
1 answer
192 views

Generalization of Schwarz's Lemma

2 votes
2 answers
197 views

Maximum Travelling Salesman Problem on the integer line

0 votes
0 answers
37 views

Tricks for Computing the Center of a Group

3 votes
0 answers
54 views

Definition of hyperprojective sets

3 votes
0 answers
300 views

Is the Imaginary Golden Ratio Unique?

0 votes
0 answers
49 views

Central Limit Theorem via Fixed Point Theorem and Entropy

1 vote
2 answers
149 views

Prove that the iterate $f^{n}$ is a constant function.

2 votes
1 answer
765 views

Convergence in norm independent of the choice of the norm.

2 votes
1 answer
568 views

Choosing distinct balls to put into identical urns.

-1 votes
3 answers
126 views

How does $ \frac{(x+1)^2}{x^{3/2} + 1 - \sqrt{x}} \cdot \frac{1}{x - \sqrt{x}}$ become $\sqrt{x} + \frac{1}{\sqrt{x}} $?

3 votes
1 answer
72 views

Invariant trees of outer automorphism of free groups

0 votes
2 answers
770 views

Does $Ax=b$ have a solution for every vector $b$ in $\mathbb{R}^3$

2 votes
1 answer
86 views

Book Recommendation for Vector Bundles

0 votes
1 answer
27 views

Decomposition of von Neumann algebra in semi-finite and purely infinite part

1 vote
1 answer
57 views

Does there exist a prime decomposition for every possible combination of ramification and inertia degree

1 vote
0 answers
92 views

Is the proposition $P$ equivalent to the axiom of regularity

1 vote
1 answer
82 views

Why don’t textbooks mention the 2-dimensional metric completion model of $S^2$?

8 votes
3 answers
284 views

Why is there no Euclidean Algorithm for the least common multiple (lcm)?

3 votes
0 answers
358 views
+50

Maximizing count of subsequences for 3 or more permutations.

0 votes
0 answers
36 views

Probabilistic behavior of Carmichael numbers

2 votes
1 answer
256 views

Symmetric product of projective planes

14 votes
2 answers
618 views

Confusion about differentials

0 votes
0 answers
16 views

isometry group of an orbifold is the quotient of the isometry group of its cover

0 votes
0 answers
72 views

Proof of Euler identity using ODE

-2 votes
1 answer
198 views
+200

Pigeonhole principle based measure

7 votes
5 answers
389 views

Prove $\int_0^af(x)\mathrm dx\ge a\int_0^1f(x)\mathrm dx$ for decreasing function

5 votes
6 answers
264 views

Find the ratio $\frac{AC}{BC}$ given a specific configuration of equilateral triangles around a right triangle(need Euclidean geometry approach)

110 votes
4 answers
6k views

Does this property characterize a space as Hausdorff?

1 vote
0 answers
44 views

The Intuition behind the nim game and the XOR?

7 votes
1 answer
761 views

Relative effective Cartier divisors

2 votes
2 answers
202 views

Is $\varphi = \frac{3\cdot 7\cdot 11\cdot\dots\cdot 599}{5\cdot 9\cdot 13\cdot\dots\cdot 601}$ greater than, less than, or equal to $\frac{1}{13}$?

24 votes
2 answers
60k views

Proof relation between Levi-Civita symbol and Kronecker deltas in Group Theory

1 vote
0 answers
29 views

Any easier ways to prove an explicit form for a generated $\sigma$-algebra besides transfinite induction?

11 votes
1 answer
467 views

Prove that $\int_0^1 |f(x) - g(x)| dx \leq \frac{1}{2}$ for two increasing functions in a $1 \times 1$ square

15 votes
0 answers
407 views
+100

Determining whether $A\subset X = \left\{0,1,\ldots,n\right\}$ can be written as $A=B+C$

1 vote
0 answers
43 views

Does each partial derivative vanish on the path from a local to a global minimum?

0 votes
3 answers
768 views

Prove linearity of map involving dual space

0 votes
0 answers
33 views

Find the locus that divides the line joining a point and any arbitrary point on the circumference of a circle in a fixed ratio

3 votes
1 answer
75 views

Prove $\frac{x^{2^n}-1}{x^{2^m}-1}$ is not a perfect square when $n, m$ have different parity

1 vote
0 answers
55 views

Difficulties in explicitly constructing the "cap" bordism

0 votes
1 answer
922 views

How to transform a random variable from [0,1] to correspond to a probability density function

3 votes
0 answers
97 views

Number of integer solutions to $\sum_{i=1}^{10} x_i = 100$ with $2 \le x_i \le 21$

1 vote
0 answers
67 views

Solving second order differential equation graphically

0 votes
1 answer
39 views

Matrices that are related to their transpose via diagonalizable matrices

2 votes
1 answer
66 views

Are analytifications in Berkovich geometry strict k-analytic spaces?

6 votes
3 answers
256 views

Prove $ a+b+c \ge ab+bc+ca $ from $ab+bc+ca+abc=4$ (from AoPS discussion)

0 votes
0 answers
68 views

From sum of three cubes to Desboves/Selmer elliptic curve

0 votes
0 answers
22 views

Showing that the trace of the difference of the square of the curvatures of two connections on a vector bundle is exact

2 votes
0 answers
39 views

Area estimate of the intersection of ball and sphere

1 vote
0 answers
30 views

What are applications of inprimitive Dirichlet characters and associated L-functions?

1 vote
0 answers
45 views

geometric problem for spiral similarity

0 votes
0 answers
34 views

Construction of Base Change/Comparison Map $g^*f_*F \to f'_* g'^*F$

1 vote
0 answers
104 views

Correspondence Local Systems & $\Bbb Z \pi_1(A)$-modules and its Compatibility

0 votes
1 answer
788 views

What is eigenvalue decay?

2 votes
1 answer
117 views
+50

Closure operator over simplicial complex

1 vote
1 answer
42 views

$\beta$ reduction rule for $\Pi$-types on free variables

10 votes
3 answers
464 views

Formula for the number of divisors of an integer

0 votes
0 answers
41 views

Factorization of a rotation matrix into the product to three rotation matrices

7 votes
2 answers
3k views

Hatcher exercise 2.1.6 (Simplicial homology)

2 votes
0 answers
17 views

Solution to a Constrained Optimal Control Problem: Is $v(t) = S/T$ Optimal

2 votes
0 answers
65 views

Generalizing integration of $[0,+\infty]$ valued functions

4 votes
0 answers
207 views
+100

Can this angle triplication construction be considered as a proof of Morley theorem?

0 votes
1 answer
770 views

Lorenz curve and Gini index using PDFs

1 vote
2 answers
121 views

Cubic equation conditions

2 votes
1 answer
762 views

Calculating cumulative Markov Chain outcomes

1 vote
0 answers
92 views

Is it plausible to express $1\cdot 5\cdot 9\cdots(4n-3)$ and $7\cdot 11\cdot 15\cdots(4n+3)$ into a single factorial?

0 votes
1 answer
46 views

Mac Lane's characterization of bifunctors in terms of one-variable functors

2 votes
3 answers
183 views

How to solve $ \lim\limits_{x\to+\infty} \!\!\left(\! \frac{x^{2}+3}{3x^{2}+1}\! \right)^{\!x^{2}}\!\!\!=0\;?$

1 vote
0 answers
35 views

Calculation of lower branch of Lambert W-function based on root of principal branch

Browse more Questions