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Interesting 52 Bountied Hot Week Month
3 votes
2 answers
29 views

Hypocycloid problem. Show that the portion of every tangent line in the first quadrant is equal 1.

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boojum
  • 2,123
0 votes
0 answers
6 views

Deviation matrix of mixed number data sets

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StackQuest
  • 435
2 votes
1 answer
110 views
+50

Prove or disprove: $t \mapsto \mathbb{P}( X_t \in A)$ is measurable

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Sangchul Lee
  • 140k
0 votes
0 answers
38 views

Evaluate $\int_0^{\infty}\frac{\log( x)}{x^2+a^2} \,dx$ using contour integration; Re a > 0

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rpr
  • 1
0 votes
0 answers
12 views

Calculate a non trivial divider of a number

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DanielG
  • 329
4 votes
1 answer
1k views

Bound on operator norm of block matrices

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Rodrigo de Azevedo
  • 18.9k
1 vote
0 answers
24 views

Does this implies $\mathcal{M}[T]_{\beta_1 \beta_2}$ is similar to the $\mathcal{M}[T]_{\beta_3 \beta_4}$?

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Sourav Ghosh
  • 4,139
1 vote
1 answer
29 views

Prove that even doubly periodic function satisfies a differential equation

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Martin R
  • 86.7k
0 votes
0 answers
9 views

Regarding a proof that $T(M\times N) \cong TM\times TN$

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Maths1999_
  • 648
0 votes
0 answers
15 views

Contour integration of $\int_{0}^{+\infty}\frac{x^2\cos x}{\cosh x} \,{\rm d}x$

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Rodrigo de Azevedo
  • 18.9k
1 vote
1 answer
21 views

How to prove this property of conditional expectation $E(X f(Y) )=E(E(X|Y)f(Y))$

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Usmur
  • 60
1 vote
1 answer
17 views

existence of non-zero proper T-invariant subspace

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Nick Castillo
  • 1,865
2 votes
1 answer
83 views

Prove that $\sum_{n=0}^\infty \frac{1}{(2n+1)^2}=\frac{\pi^2}{8}$

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C.Koca
  • 732
1 vote
2 answers
44 views

How to obtain heypercomplex numbers by an operation over complex numbers?

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Anixx
  • 7,416
0 votes
1 answer
18 views

Limit of 2 variables: two similar cases with different outcomes

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heropup
  • 112k
0 votes
0 answers
8 views

Approximation of PDF with summation to infinity, cos(x) and exp(x)

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CafféSospeso
  • 131
1 vote
1 answer
8 views

Understanding a step in a solution that limits in a metric space are unique

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Sourav Ghosh
  • 4,139
0 votes
0 answers
4 views

On the Sequence of Transformations of a Function

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Kaveh Rad
  • 1
1 vote
0 answers
17 views

If $\sum_{cyc}\frac{a}{a+1}=1$ Show that $abc\le \frac{1}{8}$

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PNT
  • 2,942
1 vote
0 answers
17 views

How many unique permutations exist on this type of rubik's cube?

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Feraminecarts
  • 25
0 votes
0 answers
15 views

Expansion of determinants.

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Rodrigo de Azevedo
  • 18.9k
1 vote
0 answers
58 views

About three consecutive powerful integers

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Tanaka
  • 19
0 votes
0 answers
8 views

Unit speed torsion and curvature question

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Bing Bong
  • 75
3 votes
3 answers
51 views

Proving that $\int^2_0fdx\ge1$ for a convex function

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Zarrax
  • 42.3k
1 vote
0 answers
33 views

Evaluate $\sum_{n=1}^\infty (\frac{1}{2}\sin x)^n $

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RobPratt
  • 33k
1 vote
1 answer
36 views

how can I linearize a constraint of the form sum(min(x(i),y(i))) for a linear optimisation problem?

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Mark L. Stone
  • 4,068
0 votes
1 answer
24 views

Possibility of constructing an orthogonal matrix

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Rodrigo de Azevedo
  • 18.9k
1 vote
0 answers
14 views

Upper Bounds for Operator Norm of Block Diagonal matrix

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RobPratt
  • 33k
-1 votes
0 answers
16 views

Does a 3x2 matrix have an identity? If yes, what is it?

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jlly
  • 1
0 votes
0 answers
23 views

Limit problem: How do I approach $\displaystyle \lim _{n\rightarrow \infty }\frac{\pi }{2^n}\sum _{j=1}^{2^n}\sin\left(\frac{j^{\pi }}{2^n}\right)$?

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Nothing special
  • 163
0 votes
0 answers
8 views

transcendental dimension of a variety

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Mahdimatika
  • 63
0 votes
0 answers
18 views

Looking for a cuvature tensor that adds up linearly

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Didier
  • 10.6k
0 votes
0 answers
19 views

Find a limit of a series

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pelfox
  • 1
0 votes
0 answers
19 views

Criterion for uniform continuity multivariable calculus

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RobPratt
  • 33k
0 votes
0 answers
18 views
+50

Convergence of sum of MLE's over all possible $0/1$ sequences

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Václav Mordvinov
  • 3,139
0 votes
0 answers
5 views

Expectation using samples from a population

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bemma
  • 3
1 vote
1 answer
62 views

Which one should I start studying - Lie Groups/Algebras or Functional Analysis?

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A plate of momos
  • 6,510
-3 votes
0 answers
14 views

You will get an A in this class if and only if you either do every exercise in this book or you get an A on the final?

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Sultan alyami
  • 1
0 votes
1 answer
19 views

Prove that $Z(A)= \cup_{i=1}^n p_i$

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Alexey Kubanov
  • 315
0 votes
1 answer
33 views

Find volume of solid bounded by $x^2+y^2=R^2,x^2+z^2=R^2$

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Quanto
  • 67.5k
0 votes
0 answers
22 views

Recovering a group from its irreducible representations?

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stacks
  • 19
0 votes
1 answer
18 views

For two objects X and Y in a category, with Y dominating X, prove that X dominates a Zero Object in our category.

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Fabio Lucchini
  • 15.3k
0 votes
0 answers
6 views

Is johnson-lindenstrauss lemma valid for a set of high dimensional complex vectors?

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NKJ
  • 35
2 votes
1 answer
3k views

Total number of paths between any two nodes - Graph vs. Complete Binary Tree

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CommunityBot
  • 1
0 votes
0 answers
28 views

$n=s^2-t^2$ how many values can $s$ take?

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Quotenbanane
  • 1,404
-1 votes
0 answers
14 views

Let $n$ be an even number. How many $n$ fair coin flip sequences have the number of heads greater than or equal to the number of tails.

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James Eade
  • 99
3 votes
2 answers
23 views

Must a certain continuous map have 0 in its image, given that its restriction to the unit sphere is homotopic to the identity?

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Eli Johnson
  • 198
0 votes
0 answers
10 views

Halting problem reduction, what am i doing wrong

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giggiox
  • 1
0 votes
0 answers
30 views
+100

Sampling distribution of GBM Maximum-Likelihood estimator

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NN2
  • 6,732
3 votes
1 answer
15 views

Is it possible that liner tranform changes interval data to ratio?

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Binxu Wang 王彬旭
  • 1,141
1 vote
0 answers
13 views

A CSP on bit vector operations

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RobPratt
  • 33k
4 votes
1 answer
49 views

What do the elements of the chains of a simplicial complex represent?

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Sammy Black
  • 16.8k
3 votes
0 answers
1k views

$\int\frac{\sqrt{9x^2-25}}{x}dx$. Using Trigonometric substitution, how to solve an integral when leading coefficient under radical isn't Unity?

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Rohit Singh
  • 413
0 votes
0 answers
9 views

Unbiased estimator of sample variance

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mathworkswizard
  • 13
0 votes
0 answers
11 views

Weak convergence and duals for $L_p$ involving time and probability space

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just a servant
  • 13
1 vote
0 answers
6 views

Question on boundary of convex sets

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Amomentum
  • 333
1 vote
0 answers
15 views

Why do Mahlo cardinals imply the totality of the finite promise games

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Boris Dimitrov
  • 161
1 vote
1 answer
16 views

Positive column in the character table of finite groups

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Sebastien Palcoux
  • 5,487
1 vote
0 answers
44 views

$2ix^4 − 10x^3 + (4 − 2i)x + 8 + 6i$ irreducible in $\mathbb Z[i][x]$ and in $\mathbb Q[i][x]$

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user26857
  • 49.7k
3 votes
0 answers
52 views

An interesting recurrent equality, possibly easier to solve in its differential form?

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Nen
  • 465
-2 votes
0 answers
16 views

Two transitive groups with non-trivial normalizer

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Shaun
  • 38k
-1 votes
0 answers
8 views

Construct all non-trivial G-invariant partitions of the natural G-set X of the transitive permutation group G - Theoretical Complexity

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Ingolfur
  • 1
1 vote
1 answer
18 views

How to find slant asymptote with exponential variable

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trula
  • 889
0 votes
0 answers
4 views

Mapping an arbitrary 4 node quadrilateral element in space (x,y,z) to unit square

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freakwave
  • 1
0 votes
1 answer
13 views

Proof of convergence of random variables in $L^p$ via convergence in probability and uniform integrability.

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Mason
  • 6,822
-1 votes
0 answers
28 views

In $L^1[0;1]$:Is every function bounded function defines only on irrational number only can be approximated by a continuous function?

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X0-user-0X
  • 74
0 votes
0 answers
5 views

Bound for $L^p$ Norm of a partial sum of a stationary sequence

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Abel1353216381
  • 11
0 votes
0 answers
10 views

How to construct a function to find the first member of an ordered pair given the pair's *n*-th position in a zig-zag enumeration

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A_becoming
  • 1
0 votes
0 answers
16 views

Is the closure of a positive convex cone positive?

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CHOSM
  • 105
0 votes
1 answer
19 views

Canonical morphism $\text{im}(f)\to\text{ker}(g)$ for exact sequence in an abelian category

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Con
  • 8,374
1 vote
5 answers
77k views

Find the common ratio of the geometric series with the sum and the first term

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libanobovich
  • 63
0 votes
0 answers
18 views

what are the steps to get these value integration these functions?

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John Alexiou
  • 10.7k
2 votes
0 answers
18 views

Expressing the fundamental group of the Klein bottle as an HNN extension appears to contradict Britton's Lemma

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Ben S
  • 103
2 votes
0 answers
14 views

If two functions are close apart can I prove the difference of their empirical loss is also small?

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Silverstalon
  • 191
1 vote
0 answers
35 views

Let $f \in C^1(\mathbb{R})$ be such that both $f$ and $f'$ belong to $L^2(\mathbb{R})$. Show that $\hat{f} \in L^1(\mathbb{R})$

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autu_mn
  • 33
0 votes
0 answers
14 views

Integral of function with any test function along curve vanishes. Does that imply that the function must vanish?

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Sjorszini
  • 1,375
0 votes
0 answers
26 views

Prob. $14$, Sec. $30$, in Munkres' TOPOLOGY, $2^{nd}$ ed: The product of a Lindelof space and a compact space is a Lindelof space

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arnav_de
  • 657
0 votes
0 answers
13 views

Hamiltonian paths in a 3 by n grid

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Ayooooo
  • 1
1 vote
0 answers
27 views

Basic Geometry, extract relation between sides and angles

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Hady
  • 11
0 votes
0 answers
12 views

Relations properties, powerset

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Terry Tan
  • 1
2 votes
0 answers
37 views

How to find the average distance between two points in a square of length $1$ by using Average = sum of all distances / number of pair of points?

user avatar
arnav_de
  • 657
1 vote
0 answers
22 views

Pell-Type Equation: show that the solutions $x,y$ are such that $\frac{x}{y}$ is a convergent

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arnav_de
  • 657
1 vote
0 answers
25 views

Calculate daily Sales budget from a monthly number based on daily sales Percentage.

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Rohit Singh
  • 413
1 vote
0 answers
8 views

definition of lie bracket of linear connection and a $\operatorname{End}(E)$-valued $k$-form

user avatar
Shrihkey Elvis
  • 41
3 votes
0 answers
48 views

Prove that $\int_{0}^{1} x K(x) E(x) \,\mathrm{d} x{=}\frac{9}{16}+\frac{21}{32} \zeta(3)$

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GalAster
  • 811
0 votes
0 answers
13 views

derivative of determinant, solve singularity equation for a variable

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AnotherUser
  • 388
0 votes
0 answers
10 views

Inverting Fourier Transform for Heat Kernel

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Dav12333
  • 1
30 votes
0 answers
841 views

Can you make the triviality of $\langle a,b,c \mid aba^{-1} = b^2, bcb^{-1} = c^2, cac^{-1} = a^2 \rangle$ more trivial?

user avatar
Robin Balean
  • 630
0 votes
0 answers
10 views

Absolute extrema of function vs. absolute extrema on closed interval of that function

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kontinuous
  • 25
0 votes
0 answers
9 views

How differentiate signals

user avatar
Han B
  • 143
0 votes
0 answers
30 views

Cardinal of a set challenge

user avatar
Celine Harumi
  • 2,347
1 vote
0 answers
15 views

intuition behind the construction of the map for showing associativity of $\pi_1(X,x_0)$.

user avatar
Kishalay Sarkar
  • 1,991
0 votes
1 answer
26 views

Convergence of series over a complex lattice

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MathWonk
  • 1,487
1 vote
0 answers
5 views

How to the estimate as application of Strichartz Estimates?

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Analyst
  • 91
0 votes
0 answers
19 views

If $X$ and $Y$ are conditionally independent given $Z$, and $X$ and $Z$ are conditionally independent given $Y$, are $X,Y,Z$ independent?

user avatar
user438666
  • 1,930
1 vote
1 answer
57 views

Is this a misprint or not?

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Lorago
  • 2,421
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