User Friedman

17 votes

8 answers

7k views

Examples of closed sets with empty interior

asked Dec 27, 2016 at 0:09

14 votes

1 answer

4k views

Does taking expected value of two sides of inequality maintain the inequality?

asked Jan 8, 2018 at 22:25

8 votes

3 answers

20k views

Example of an integral domain which is not a field

asked Sep 1, 2017 at 13:41

5 votes

1 answer

1k views

Trying to figure out $\mu(\liminf_{n\to \infty}A_n) \le \liminf_{n\to \infty}\mu(A_n)$

asked Jan 22, 2018 at 11:39

4 votes

2 answers

854 views

Explaining an example of a topology not induced by a metric

asked Mar 22, 2018 at 17:12

4 votes

4 answers

258 views

A Combinatorial/Algebraic Solution to Combinatorics Identities Exercise

asked Jan 4, 2021 at 12:57

2 votes

2 answers

133 views

A false proof for the theorem about finite integral domains and fields

asked Sep 2, 2017 at 13:15

1 vote

2 answers

526 views

Partitioning a metric space with interior, exterior and boundary of a set

asked Nov 23, 2016 at 21:01

1 vote

1 answer

415 views

Transitive group action and meaning of "The usual action of $S_n$"

asked Dec 12, 2016 at 23:00

1 vote

1 answer

130 views

Explaining an ideal example in the $\mathbb{Q}[x,y]$ ring

asked Mar 22, 2017 at 13:44

1 vote

1 answer

109 views

Clarifying a part of Caratheodory's theorem proof

asked Jan 29, 2018 at 13:25

1 vote

1 answer

163 views

Clarifying a proof that a certain set is an algebra

asked Jan 23, 2018 at 11:06

1 vote

1 answer

65 views

Probability Question With Normal and Exponential distributions

asked Feb 11, 2021 at 19:09

1 vote

1 answer

408 views

Find all Solutions of the Following Differential Equation

asked May 30, 2017 at 12:55

0 votes

1 answer

49 views

Can I refer to the interval $[0,1]$ as an uncountable union of singletones? [closed]

asked Jan 28, 2018 at 18:15

0 votes

1 answer

51 views

The reason for a certain requirement in upper-semicontinuity

asked Jan 20, 2018 at 20:05

0 votes

1 answer

61 views

Proving a property of a $L^1(\mu)$ function.

asked Jan 30, 2018 at 11:06

0 votes

2 answers

333 views

Disconnectedness of closed intervals in Sorgenfrey's line

asked Apr 28, 2018 at 20:21

0 votes

1 answer

142 views

On which open intervals are the following functions linearly dependent? (Hyperbolic functions)

asked May 9, 2017 at 21:39

0 votes

2 answers

176 views

Discontinuity and the existence of partial derivatives

asked May 18, 2017 at 22:01

0 votes

1 answer

143 views

Are the Projections' Inverses on Product $\sigma$-Algebra Well Defined?

asked Oct 30, 2017 at 17:11

-1 votes

2 answers

523 views

How to find the parameter b such that the following sum of quadratic expressions is minimized?

asked Sep 6, 2020 at 20:30

-2 votes

2 answers

92 views

Calculating $\lim\limits_{x \to 0} \frac{\sin^2(5x)-\sin^2(x)}{x \sin(7x)}$ [closed]

asked Dec 17, 2021 at 13:09

Stack Exchange Network

23 Questions

Examples of closed sets with empty interior

Does taking expected value of two sides of inequality maintain the inequality?

Example of an integral domain which is not a field

Trying to figure out $\mu(\liminf_{n\to \infty}A_n) \le \liminf_{n\to \infty}\mu(A_n)$

Explaining an example of a topology not induced by a metric

A Combinatorial/Algebraic Solution to Combinatorics Identities Exercise

A false proof for the theorem about finite integral domains and fields

Partitioning a metric space with interior, exterior and boundary of a set

Transitive group action and meaning of "The usual action of $S_n$"

Explaining an ideal example in the $\mathbb{Q}[x,y]$ ring

Clarifying a part of Caratheodory's theorem proof

Clarifying a proof that a certain set is an algebra

Probability Question With Normal and Exponential distributions

Find all Solutions of the Following Differential Equation

Can I refer to the interval $[0,1]$ as an uncountable union of singletones? [closed]

The reason for a certain requirement in upper-semicontinuity

Proving a property of a $L^1(\mu)$ function.

Disconnectedness of closed intervals in Sorgenfrey's line

On which open intervals are the following functions linearly dependent? (Hyperbolic functions)

Discontinuity and the existence of partial derivatives

Are the Projections' Inverses on Product $\sigma$-Algebra Well Defined?

How to find the parameter b such that the following sum of quadratic expressions is minimized?

Calculating $\lim\limits_{x \to 0} \frac{\sin^2(5x)-\sin^2(x)}{x \sin(7x)}$ [closed]