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Score of 0
1 answer
34 views

Any row-column operations that would fit in this determinant?

Score of 0
0 answers
48 views

Is the number of unknowns in this setup low enough to solve for them all?

Score of 36
2 answers
1695 views

(Dis)Prove $\sum_{i=1}^n\sum_{j=1}^n{(|x_{i}-x_{j}|-|y_{i}-y_{j}|)^2}\geq 4$

Score of 6
3 answers
470 views

Can Toda's proof of the vector triple product identity be made rigorous?

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0 answers
9 views

uniqueness backwards in time of ODE: no solution starting at $x_0$ can reach the fixed point $y_0$

Score of 1
1 answer
159 views

Integrating $\int^\pi_{-\pi}\frac1{a\cos^2(2x)+1}\,dx$. Why isn't my method working?

Score of 2
1 answer
40 views

Graph with the most edges, given maximum degree N and any two edges at distance at most 1 from each other

Score of 7
5 answers
936 views

Something similar to the bizarre Koide formula?

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0 answers
25 views

Combinatorics of "inwards" sequence

Score of 5
2 answers
204 views

Number Squared plus One is a Power of Two

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1 answer
534 views

Inverse Gamma Distribution and Pareto distribution

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0 answers
15 views

Literature on continuous-time Markov chains

Score of 5
3 answers
1001 views

Max Area Under the Curve with $y = \sqrt{6-x}$

Score of 3
3 answers
120 views

Curvature for Circle and Helix Intuition

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0 answers
15 views

Understanding The Travel-Time Integral In The Brachistochrone Problem Using Riemann Sums.

Score of 8
2 answers
206 views

Prove that a cyclic sequence of positive reals with harmonic means among its terms is constant

Score of 4
1 answer
76 views

Can arbitrary connective commutative differential-graded algebras be described inductively using classical algebraic geometry?

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2 answers
45 views

Is it always true that linear combinations of variables from stable distributions are in the same distribution family? Why?

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1 answer
548 views

Evaluate the surface integral $\iint z \cos \gamma \, dS$ over an unit sphere.

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1 answer
46 views

Proof $\sum \frac{a^3}{b+c} \ge \frac{a^2+b^2+c^2}{2}$, How about $\sum \frac{a^{k+1}}{b+c} \ge \frac{a^k+b^k+c^k}{k}$ for $k \in N$?

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0 answers
22 views

Numerical integration and numerical interpolation interchangeability

Score of 1
0 answers
25 views

Unknotting number of the Whitehead link

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0 answers
21 views

equivalent ideals and $L$-functions by Hecke

Score of 4
1 answer
94 views

If $K=\{ x\in G \mid f(x)=x^{-1} \}$ has order more than 3/4 the order of $G$, then $K=G$ and $G$ is abelian

Score of 1
2 answers
551 views

Efficient method of approximating a distribution with Gaussian

Score of 1
1 answer
54 views

Surjective smooth mapping into $SO(3)$ that is not of constant rank

Score of 5
1 answer
523 views

Proof that every polygon has at least 2 ears

Score of 13
4 answers
1219 views

How to show that $\frac{K(k')}{K(k)}=\sqrt{7} \implies k=k_{7}=\frac{\sqrt{2}}{8}(3-\sqrt{7})$?

Score of 7
2 answers
216 views
+50

An Interesting Self-referential Sequence: $a_n=\cdots+a_kn^k+\cdots+a_2n^2+a_1n+a_0$

Score of 1
1 answer
126 views

On Hermite's solution of the quintic equation

Score of 15
1 answer
530 views

The Cauchy Product of $(\operatorname{Li}_2(x))^3$

Score of 1
1 answer
131 views

Integral of product of two error functions

Score of 1
0 answers
129 views

Degree of polynomials in vanishing ideals of varieties.

Score of 5
1 answer
2227 views

Accuracy of the Newton-Cotes formulas for polynomials of degree $n+1$ and even $n$

Score of 3
2 answers
205 views
+50

Counting Regions Formed by Nested Polygons Constructed from Side Midpoints

Score of 2
1 answer
87 views

Is $\frac{d^2}{ds^2}\ln\bigl(-H_m''(s)\bigr)<0$ right?

Score of 2
1 answer
57 views

Infinite half-transitive graphs of odd degree

Score of 14
3 answers
559 views

Set of Five 5-Digit Numbers Such That Their Fifth Powers Sum Up to the Concatenation of the Numbers

Score of 8
4 answers
243 views

Is there any other way to compute $ \int_{-\infty}^{+\infty} \frac{\sin (x+1)}{x^3+x^2+x+1} d x?$

Score of 1
1 answer
529 views

Domain of the Fisher $z$-transformation

Score of 7
3 answers
343 views
+200

How to find $\min\left\{\frac{a}{a+2ab+3}+\frac{b}{b+2bc+3}+\frac{c}{c+2ca+3}\right\}$ for $ab+bc+ca=3$ and $a,b,c\ge0$?

Score of 1
0 answers
51 views

Conceptual question about applying the uncertainty principle to a solution of finite duration

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0 answers
83 views

Second degree polynomials and their surfaces

Score of 1
1 answer
78 views

Are integer runs the hardest sets of a certain size to cover with prime-gap arithmetic progressions?

Score of 0
0 answers
46 views

Classification of all pairs $(X, A)$ where $A$ is a retract but not a deformation retract?

Score of 3
1 answer
71 views

Extension of Van der Waerden infinite case

Score of 5
1 answer
399 views

How to calculate part of sphere area bounded by two planes?

Score of 0
2 answers
113 views

Calculate $\int\limits_{-1}^1\int\limits_{-\sqrt{1-y^2}}^1\int\limits_{-1}^1(x^2+y^2)^{3/2}\,dz\,dx\,dy$

Score of 3
1 answer
712 views

Deducing that $f'(x)$ cannot have jump discontinuity from a theorem

Score of -3
0 answers
71 views

Relations between formulas and their expressions in $P$.

Score of 4
1 answer
171 views

Is the join of the left and right identities one-based?

Score of 14
5 answers
8770 views

Why is there no continuous square root function on $\mathbb{C}$?

Score of 1
1 answer
172 views

Show $\frac{x^2-3}{3y^2+5}\notin \Bbb{Z}$ for any integers $x,y$

Score of 115
16 answers
18726 views

Intuitive explanation of Cauchy's Integral Formula in Complex Analysis

Score of 4
2 answers
219 views

Show that $M^n-N^{n-1}$ has exactly two components with $N^{n-1}$ as the topological boundary of each.

Score of 0
3 answers
121 views

Wreathed Permutations

Score of 55
1 answer
21891 views

Submodule of free module over a p.i.d. is free even when the module is not finitely generated?

Score of 0
0 answers
51 views

How to compute the Fourier symbol of a discretised pde in time?

Score of 7
4 answers
445 views

Solving Improper Rational Trig Integral

Score of 3
1 answer
504 views

Mutual information as a fraction of entropy?

Score of 2
1 answer
106 views

$f(\frac{\sqrt {13} - 1}{2}),f(1),f(2)$ are all primes implies irreducible polynomial?

Score of 0
3 answers
508 views

Find Polynomial With roots that are the square of the original roots.

Score of 1
0 answers
174 views

Dimensions and cut angles of several wooden slabs needed to construct a workshop chair

Score of 3
2 answers
211 views

Ramification index and inertia degree for composition and "base change" of number fields

Score of 2
0 answers
88 views

A Stieltjes integral formula for a logarithmic derivative

Score of 6
1 answer
136 views

How ring homomorphism induces morphism of locally ringed spaces

Score of 1
1 answer
967 views

Solving system of linear equations with cyclic three-diagonal matrix

Score of 2
1 answer
292 views

Create a triangle by knowing the feet of the angle bisectors

Score of 4
1 answer
1240 views

Number of zeros of Wronskian

Score of 8
5 answers
542 views

What is the length of the equal diagonals of this quadrilateral?

Score of 5
3 answers
176 views

Limits of information encoding using tiles and mask

Score of 1
0 answers
76 views

On the dimension of the solution space of a homogeneous system of linear equations when another equation is added

Score of 3
2 answers
483 views

Prove that $a_0 = \sqrt{2}, a_{n+1} = \sqrt{2 + \sqrt{a_n}}$ converges and find its limit

Score of -3
0 answers
42 views

Summing Natural Numbers Using a Quadruplet Transition Constant

Score of 2
2 answers
555 views

Integrating $\int \frac{dx}{\sqrt{-x^2 + 3x - 4}}$

Score of 0
0 answers
108 views

Can Thales's Intercept Theorem be proven strictly from the Angle Bisector Theorems using an iterative limit process?

Score of 1
1 answer
66 views

Proving distance from center to focus of hyperbola in terms of semitransverse and semiconjugate axes

Score of 1
1 answer
95 views

When does a linear shift operator preserve Pascal’s recurrence?

Score of 3
1 answer
636 views

the solution of Fredholm´s integral equation

Score of 4
0 answers
161 views
+150

Calculating Wirtinger presentation of the group of the Granny knot and the Square knot

Score of 6
3 answers
1713 views

Find a non-negative function on $[0,1]$ such that $t\cdot m(\{x:f(x) \geq t\}) \to 0$ that is not Lebesgue integrable

Score of 8
2 answers
542 views

Divergence of knot energy integral

Score of 2
1 answer
144 views

Simplifying $\ln(x!)$ to find Stirling formula's relative error.

Score of 1
2 answers
152 views

Evaluate $f(x)=(1−\cos(x))/x$ for arguments $0<x≪1$

Score of 1
1 answer
47 views

Regarding connectedness and faithfulness in Martelli's Proposition 1.5.1 on group actions.

Score of 2
1 answer
130 views

What can we say about $S=\sum_{n=1}^{\infty}\frac{1}{n^{2}\operatorname{erf}\left(n\right)}$?

Score of 2
1 answer
1260 views

Hitting probabilities for Brownian motion

Score of 2
0 answers
78 views

When does a closed body $K\subset\mathbb{R}^n$ share a centroid with the Minkowski sum of $K$ and the $n$-ball of radius $r$, for all $r>0$?

Score of 0
0 answers
26 views

About $Ch_{N_\alpha} \in N$ in Lemma 5.4 of Abraham, Magidor

Score of 1
3 answers
181 views

Finding the shaded area in a $6\times6$ grid

Score of 1
1 answer
503 views

If extension $E/F$ has degree $2$, how can we show that $E=F(\alpha)$ where $\alpha$ is a root of $t^2 - b$, $b \in F$? ($F$ in characteristic $0$)

Score of 0
1 answer
57 views

Lower bound on the dimension of a sufficient statistic for a pREC

Score of 12
2 answers
509 views

Does there exist a closed map of a Hausdorff space onto the cofinite topology?

Score of 2
1 answer
523 views

Asymmetric random walk with absorbing barriers as a martingale

Score of 3
0 answers
83 views

What is the precise geometric relationship between the non-commutativity of $SO(3)$ and the curvature of its manifold?

Score of 2
1 answer
668 views

Intensity of a compensator

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