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Atbey's user avatar
Atbey's user avatar
Atbey
  • Member for 8 years, 1 month
  • Last seen more than a week ago
44 votes
Accepted

Is there a clever solution to Arnold's "merchant problem"?

5 votes
Accepted

Simplify: $ \frac {\sqrt2+\sqrt3+\sqrt4}{\sqrt2+\sqrt3+\sqrt6+\sqrt8+4}$

5 votes

Is a continuous function $ f\colon(0,\infty)\to R$, such that $f(x)\leq f(nx)$ increasing?

4 votes

Apostol's proof on uniform convergence and continuity

4 votes
Accepted

Is there a correct mathematical way to prove the arc length integral from the pythagorean theorem?

3 votes
Accepted

Is there any quick way to do this problem?

3 votes

Every infinite subset of $E$ in $\mathbb R^k$ having a limit point in $E$ implies $E$ is closed

3 votes

Is $C$ an infinite set?

3 votes
Accepted

complex norm inequality

3 votes
Accepted

How to see wether numbers are distributed "evenly" ([1,2,18,35,36]) or "cluttered to one side" ([1,2,3,30,31], [7,9,17,16,36])?

3 votes
Accepted

$E[1/(1+e^X)] = 1/2$ for standard normal $X$

2 votes

Prove $P(\bigcup_{i=1}^nA_i) \ge \sum_{i=1}^nP(A_i)-\sum_{1\le i \lt j \le n}P(A_i \cap A_j)$

2 votes
Accepted

where's the error of this calculation?

2 votes

Probability of minimum size of intersection of two subsets

2 votes

Determine the monotonicity of the following series based on parameter

2 votes
Accepted

Converting polar equations to cartesian

2 votes
Accepted

Determining the convergence of improper integrals?

2 votes
Accepted

estimate the maximum error of taylor approximation of $\ln(x)$

2 votes

Prove that $a_{n}$ Increasing and $b_{n}$ Decreasing

1 vote
Accepted

Pointwise Convergence implies convergence of integral of Exponential

1 vote

Modified standard normal distribution

1 vote

Checking for convergence of $\sum_{n=0}^\infty\frac{(-1)^nn}{n^2+1}$

1 vote
Accepted

Probabilty one random variable exceeds another by at least k

1 vote
Accepted

Proving a continuous function on a closed interval that never repeats a value is strictly increasing

1 vote
Accepted

Help understanding proof with conjugacy classes

1 vote

Determining the expression of $f(x,y)$ as a function of $z$

1 vote

I can't undestand why $ \{x \in X : f(x) > g(x) \} = \bigcup_{r \in \mathbb{Q}}{\{x\in X : f(x) > r\}\cap\{x\in X:g(x) < r\}} $

1 vote

why can we expand an expandable function for infinite?

1 vote

Pointwise/uniform convergence of $ f(x) = \begin{cases} +\infty, & \text{if }0<x<0 \text{ (???)}\\ 1, & \text{if }1/(2n)≤x<1 \end{cases} $

1 vote

The largest sum of products of pairs of number's terms