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Score of 0
1 answer
71 views

Gaps in Rudin's Fourier Analysis on Groups, 1.1.4?

Score of 18
2 answers
22524 views

Properties of the trace norm

Score of 1
1 answer
528 views

Calculating volume of two perpendicular cylinders intersection

Score of -1
0 answers
23 views

placing combinations

Score of 7
3 answers
533 views
+100

Can a circle and an “infinitely sided polygon” be distinct objects satisfying the same limiting or geometric relation?

Score of 3
1 answer
798 views

Proof that for any n-sided polygon P, and any integer m greater than n, there is an m-sided polygon with the same area and perimeter as P?

Score of 1
1 answer
122 views

Timelike curves

Score of 2
3 answers
165 views

How can I find the angle in this geometry problem?

Score of 8
3 answers
678 views
+500

How to evaluate $\int_{-1}^1\frac{1}{x}\sqrt{\frac{1+x}{1-x}} \ln^p \left( \frac{(r-1)x^{2} + sx + 1}{(r-1)x^{2} - sx + 1} \right) \, \mathrm dx$?

Score of 0
0 answers
11 views

Show that the singular support of the kernel of a pseudolocal operator is contained in the diagonal.

Score of 18
11 answers
2136 views

Why does angle need a unit in mathematics?

Score of 1
2 answers
89 views

Continuity condition in Munkres's definition of a tensor field. ("Analysis on Manifolds" by James R. Munkres)

Score of 2
1 answer
92 views

Does the interval $(a,11a/5]$ always contain at least $\lfloor\sqrt a\rfloor$ primes?

Score of 2
1 answer
83 views

For fixed $n$, there are integer arithmetic and geometric progressions $a_i$ and $b_i$ such that $b_1 < a_1 < b_2 < a_2 < \cdots < b_n < a_n$

Score of 3
0 answers
74 views

Generalization of Hilbert’s 90 to Abelian $p$-groups

Score of 2
3 answers
165 views

Integrate $ \int \sin^7 x\,dx $ without trigonometric substitution

Score of 7
6 answers
160 views

Determining the area of a $12$ sided polygon in an elegant fashion

Score of 24
2 answers
769 views

When can the sequence $1,2,3,\dots,n$ be reversed? (Legal moves involve divisibility and rotation.)

Score of 1
1 answer
105 views

Prove the existence of a non trivial solution of the following PDE

Score of -2
0 answers
18 views

Solving double indexed differential recurrence with coupling term

Score of 0
1 answer
540 views

Monotonic function always has (±infinite) limit

Score of 9
3 answers
460 views

Which arithmetic progressions can be proved to have infinitely many primes without analytic tools?

Score of 1
1 answer
665 views

Nth Branch of Lambert W function

Score of 0
1 answer
543 views

Pre-image of an empty set for a non-bijective function

Score of 2
1 answer
112 views

On the integral $\int_0^{\pi/2}\frac{dx}{\sqrt{1+\sin^3(x)}}$

Score of 4
3 answers
414 views

Isn't the choice of 1 as a threshold for sum-of-squared-errors somewhat arbitrary and poorly motivated?

Score of 0
1 answer
530 views

Knowing that the weight corresponding to the third quartile [...] calculate the value of μ and the value of σ.

Score of 5
1 answer
64 views

Terminology for a continuous map that factors as a quotient map followed by a subspace inclusion

Score of 1
1 answer
91 views

Residual finiteness of semidirect products of the torsion Grigorchuk group with $\mathbb{Z}$

Score of 0
2 answers
537 views

How many ways to withdraw $k$ balls from an urn with $n$ red and $m$ blue ones?

Score of 22
1 answer
4037 views

Homogeneous topological spaces

Score of 0
0 answers
14 views

Closed form for the minimal weighted $L^2$ norm of a monic polynomial on exactly $d+1$ nodes

Score of 3
0 answers
70 views

Visualizing a decomposition of the Grassmannian $\operatorname{Gr}(2, F^3)$

Score of 0
1 answer
872 views

Saturation of a submodule

Score of 8
0 answers
337 views
+100

Can someone help me understand Steve Smale's thought process in a proof using the parametric transversality theorem?

Score of 15
7 answers
2126 views

Approximating $\log x$ with roots

Score of 0
1 answer
43 views

Is it possible to find the surface area of part of a 3D surface with non-constant Gaussian curvature?

Score of 3
2 answers
142 views

Find $k$ when $\int_0^1\frac{2(x^m+x^n)dx}{(1+x)^{m+n+2}}=k\int_0^1 x^m(1-x)^ndx$ for each $m,n\ge1$.

Score of 0
1 answer
550 views

Conditions on Hypothesis testing

Score of 2
1 answer
45 views

Banach operator ideals which coincide over real Banach spaces, ¿do they coincide over complex Banach spaces?

Score of 69
16 answers
12578 views

Choice of $q$ in Baby Rudin's Example 1.1

Score of 11
6 answers
779 views

How to solve for $x$ in $\sqrt[4]{x+27}+\sqrt[4]{55-x}=4$?

Score of 3
3 answers
2407 views

Use the Cauchy-Schwarz Inequality to prove that $a^2+b^2+c^2 \ge ab+ac+bc $ for all positive $a,b,c$.

Score of 5
1 answer
499 views

A detailed and self-contained proof of Fubini's theorem for Banach spaces

Score of 2
1 answer
92 views

Is the method I used valid for generalized case?

Score of 0
1 answer
653 views

Probability of observing sequence Markov model

Score of 1
2 answers
74 views

Base change preserving irreducibility?

Score of 0
0 answers
29 views

Asymptotic Matching With Unsolvable Inner Region

Score of 0
3 answers
554 views

Minimum distance between two boats travelling in different velocities

Score of 3
1 answer
66 views

Significance of Relation between Laplace-Beltrami in Horocyclic Coordinates

Score of 1
0 answers
36 views

Centraliser of the fundamental group of a finite volume hyperbolic manifold is trivial

Score of 0
1 answer
89 views

Theorem 32.4 in Munkres' TOPOLOGY, 2nd ed: Is every subspace of a well-ordered set normal?

Score of 0
1 answer
666 views

Kronecker Delta tensor proof

Score of 2
4 answers
160 views

Finding the matrix $Q$ from the equation $AQ=B$ in which $A$ is not a square matrix.

Score of 1
5 answers
232 views

Finding the expected number of examined items before drawing a defective one

Score of 1
1 answer
365 views

Quadratic Optimization Problem to Feasibility Problem

Score of 0
1 answer
747 views

If we want to choose $3$ from $5$ why do we not calculate $\binom{5}{1} \cdot \binom{4}{1} \cdot \binom{3}{1}$?

Score of 2
0 answers
108 views
+100

Divergence of knot energy integral

Score of 1
1 answer
41 views

Can a non-zero matrix coefficient of an unramified Steinberg representation ever be compactly supported

Score of 1
1 answer
543 views

Fatou's Lemma conditions for strict inequality

Score of 1
1 answer
94 views

Determine angle $\alpha$ using methods from plane synthetic geometry only

Score of 1
0 answers
177 views

Is This Explanation of Euler's Formula Valid?

Score of 7
0 answers
196 views
+150

Evaluation of an improper integral involving hyperbolic and trigonometric functions

Score of 6
1 answer
645 views

show that $X^4-4X^2-21$ is solvable by radicals

Score of 1
1 answer
313 views

Folland 2.57 and 2.58 - question about limits of integration

Score of 3
1 answer
2337 views

Expected value of two dependent Bernoulli random variables.

Score of 7
6 answers
649 views

In order to parameterize, more numerical solutions are requested for the $a^4+b^4+c^4+d^4=e^4$ quartic equation

Score of 1
2 answers
226 views

Substitution for the condition $a^{2}+ b^{2}+ c^{2}+ 3abc= 6$

Score of 6
0 answers
89 views

Vector spaces vs. modules over a division ring: Seeking a categorical difference

Score of 18
13 answers
774 views

Prove that $\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\cdots+\frac{1}{100}>4$

Score of 3
2 answers
140 views

Let $a ,b, c$ denote the sides of a triangle such that $ab+bc+ac=12$, what is the maximum of $(a+b+c)$?

Score of -1
0 answers
32 views

measure of cross is a measure function ($\nu$ is a $\sigma$-finite measure)

Score of 4
3 answers
168 views

Sum involving squares of binomial coefficients

Score of 2
3 answers
130 views

How to raise/lower indices when the index is part of the argument of a derivative?

Score of 4
1 answer
172 views

Is there a *mapping theory* as a subfield of set theory?

Score of 1
1 answer
138 views

measure of cross section is a measurable function ($\nu$ is a finite measure)

Score of 10
2 answers
403 views

Is there an equational identity that holds for the sedenions but not the trigintaduonions?

Score of 7
2 answers
901 views

On why solutions to $a^4+b^4+c^4+d^4 = (a+b+c+d)^4$ also come in pairs

Score of 4
2 answers
176 views

Minimize $P=\frac{a}{a+2ab+3}+\frac{b}{b+2bc+3}+\frac{c}{c+2ca+3}$ for $ab+bc+ca=3$

Score of 10
2 answers
296 views

A question about the vector space spanned by shifts of a given function

Score of 0
1 answer
545 views

Local diffeomorpism is a covering?

Score of 4
1 answer
83 views

Weak convergence of a distribution on $\mathbb T$ to the uniform distribution

Score of 0
0 answers
32 views

Non-Existence for Forward-Index Multiplicative Recurrences

Score of 3
0 answers
241 views

Closed form for $\sum_{n=1}^{\infty}\sum_{m=1}^{\infty} \frac{(-1)^{n+m}}{\lfloor\sqrt{n^2+m^2}\rfloor^3}$

Score of 1
1 answer
45 views

Which transitive subgraphs of the $<$ relation on $\{1...n\}$ are the crossings of a permutation?

Score of 3
0 answers
29 views

Terminology behind factoring and lifting maps

Score of 0
1 answer
546 views

Smoothly extending a smooth function.

Score of 0
1 answer
87 views

How to rigorously relate a set of points $S$ on the Euclidean plane w.r.t $xy$-axes vs w.r.t $xy$-axes rotated (call it $XY$-axes)?

Score of 8
2 answers
875 views

An alternate proof of Fuglede's theorem

Score of 10
3 answers
12126 views

Equivalent Topologies

Score of 0
1 answer
536 views

Stationary state of an infinite markov chain

Score of 1
4 answers
285 views

Comparing $\frac{13}{10}$, $\frac{113}{101}$, $\frac{1013}{1001}$ in ten seconds

Score of 1
0 answers
145 views
+50

Let $X$ be a Hausdorff locally convex space non barrelled

Score of 17
6 answers
3540 views

Number which is simultaneously sum of 2 and 3 squares

Score of 2
1 answer
537 views

Combinatorics, expected value, drawing balls from a bag, and customer support

Score of 12
6 answers
982 views

Probability of rolling every even face before any odd face

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