Top Questions

active 22featured hot week month
2
votes
1
answer
102
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Variance of a max function

statistics standard-deviation
1m ago Community♦ 1
0
votes
0
answers
6
views

Euclidian Domain, if distances equal then element has inverse

homework group-theory
1m ago Sirzh 1
2
votes
1
answer
86
views

0 Prove for x>0 $$\lim_{x\to0} \frac{1}{2πi} \int_γ \left(\frac{1}{z-w} - \frac{1} {z-w'}\right)dz = -1$$ Where $w=z_0 + x$ ...">Complex Analysis Help

complex-analysis complex-integration
2m ago Christian Blatter 24k
0
votes
0
answers
17
views

Problem with proving an equation. (Sets)

elementary-set-theory proof-writing
2s ago Asaf Karagila 55.3k
1
vote
2
answers
22
views

How do I get the integer part of a number by using basic arithmetic?

arithmetic fractions rational-numbers fractional-part
4m ago sperners lemma 638
0
votes
3
answers
31
views

Show that exactly one of the equations has a solution.

optimization
4m ago saz 466
1
vote
6
answers
120
views

Am I correct if I say $\lim_{n\rightarrow\infty}\sum_{k=1}^n\frac{\sqrt{k}}{(k+1)^2}$ converges?

sequences-and-series
5m ago Cameron Buie 10.7k
0
votes
0
answers
8
views

First decimal digits of factorial n divided by x

factorial
7m ago Nicolas 13
3
votes
3
answers
71
views

We define a sequence of rational numbers {$a_n$} by putting $a_1=3$ and $a_{n+1}=4-\frac{2}{a_n}$ for all natural numbers. Put $\alpha = 2 + \sqrt{2}$

recurrence-relations
11m ago jill 1
4
votes
2
answers
47
views

Finding Higher Bound on Probability Independent Set

probability probability-theory graph-theory
12m ago saposcat 90
1
vote
3
answers
38
views

What's the derivative of the integral of $\sin(t) \text{d}t $ from $1$ to $x$?

calculus
15m ago amWhy 7,406
1
vote
2
answers
20
views

find the precise range of of the following sum

summation
16m ago Brian M. Scott 99k
3
votes
1
answer
41
views

Does there exist a sequence $\{a_n\}_{n\ge1}$ with $a_n < a_{n+1}+a_{n^2}$ such that $\sum_{n=1}^{\infty}a_n$ converges?

calculus real-analysis sequences-and-series analysis contest-math
17m ago Pambos 1,973
2
votes
1
answer
55
views

Eigenvalues and power of a matrix

linear-algebra matrices
19m ago EuYu 10.1k
2
votes
2
answers
84
views

How many ways can the letters of the word TOMORROW be arranged if the Os can't be together?

combinatorics
22m ago ashley 11
0
votes
0
answers
14
views

Vector operation resulting in matrix of products of consecutive subsequences of coordinates

linear-algebra optimization
28m ago Bitwise 280
2
votes
0
answers
14
views

Operators - sums, products, exponents, etc.

notation exponentiation summation products tetration
28m ago Micah 3,758
0
votes
0
answers
20
views

Isomorphisms between finite abelian groups

group-theory
29m ago user49097 11
0
votes
2
answers
19
views

Finding An Equation For A Parabola

homework geometry algebra-precalculus conic-sections
29m ago Fly by Night 1,687
1
vote
2
answers
31
views

I don't understand why $X = \sum_{i=1}^n X_i$ and $Y = \sum_{i=1}^n Y_i$

probability
32m ago André Nicolas 112k
1
vote
1
answer
11
views

Evaluating $\lim_{n\to\infty}\left(\frac{n \cdot n!}{e\cdot (-2)^{n+1}}\cdot \left(1-e^2 \sum_{k=0}^{n} \frac{(-2)^k}{k!}\right)\right)$

calculus real-analysis sequences-and-series limit
34m ago Marvis 43.2k
0
votes
0
answers
12
views

Inverse of Toeplitz Matrix Property

linear-algebra matrices operator-theory
39m ago Keaton 157
10
votes
4
answers
207
views

What is the significance of multiplication (as distinct from addition) in algebra & ring theory?

abstract-algebra ring-theory
40m ago amWhy 7,406
0
votes
0
answers
7
views

dihedral group $D_{8}$ + semidirect product

group-theory
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