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Friedman's user avatar
Friedman's user avatar
Friedman
  • Member for 8 years, 3 months
  • Last seen more than a week ago
  • Israel
17 votes
8 answers
7k views

Examples of closed sets with empty interior

14 votes
1 answer
4k views

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

8 votes
3 answers
20k views

Example of an integral domain which is not a field

5 votes
1 answer
1k views

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

4 votes
2 answers
854 views

Explaining an example of a topology not induced by a metric

4 votes
4 answers
258 views

A Combinatorial/Algebraic Solution to Combinatorics Identities Exercise

2 votes
2 answers
133 views

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

1 vote
2 answers
526 views

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

1 vote
1 answer
415 views

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

1 vote
1 answer
130 views

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

1 vote
1 answer
109 views

Clarifying a part of Caratheodory's theorem proof

1 vote
1 answer
163 views

Clarifying a proof that a certain set is an algebra

1 vote
1 answer
65 views

Probability Question With Normal and Exponential distributions

1 vote
1 answer
408 views

Find all Solutions of the Following Differential Equation

0 votes
1 answer
49 views

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

0 votes
1 answer
51 views

The reason for a certain requirement in upper-semicontinuity

0 votes
1 answer
61 views

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

0 votes
2 answers
333 views

Disconnectedness of closed intervals in Sorgenfrey's line

0 votes
1 answer
142 views

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

0 votes
2 answers
176 views

Discontinuity and the existence of partial derivatives

0 votes
1 answer
143 views

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

-1 votes
2 answers
523 views

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

-2 votes
2 answers
92 views

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