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user24142
  • Member for 9 years, 4 months
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46 votes
Accepted

Is it possible for integer square roots to add up to another?

16 votes
Accepted

Why does a Borel measurable function imply its Lebesgue measure?

12 votes
Accepted

Can a Lie group be a manifold with boundary?

10 votes
Accepted

Can we find uncountably many disjoint dense measurable uncountable subsets of $[0,1]$?

9 votes

Proof of $\mathbb{Q}$ is not cyclic

8 votes

What is the minimum and maximum number of eigenvectors?

7 votes

Definition of compact support

6 votes
Accepted

Can a real function $f$ on $[0,1]\cap\mathbb{Q}$ be differentiable?

6 votes

Finite measure space & sigma-finite measure space

6 votes
Accepted

Induced measure needs not to be sigma-finite

5 votes

How fundamental is Euler's identity, really?

5 votes

Find $E\subseteq\mathbb{R}$ such that $\liminf_{\delta\to 0}\frac{m(E\cap(-\delta,\delta))}{2\delta}=\alpha$

4 votes
Accepted

Proof for $0a = 0$

4 votes

What is the implication of Perron Frobenius Theorem?

3 votes

At most one divisor in $[\sqrt{n},\sqrt{n}+\sqrt[4]{n}]$

3 votes

If $A^3=A+I$, then $\det A>0$

3 votes

Finding the distance from ellipsoid to plane

3 votes
Accepted

Can one generate a sequence of natural numbers whose density has a given distribution?

3 votes

Unions and intersections: $(A \cup B = A ∪ C) \land (A \cap B = A ∩ C) \implies B = C.$

3 votes
Accepted

Sufficient conditions for this function being constant

3 votes
Accepted

How do you show that conjugate mapping, $ f(z)=\bar {z}$ isn't linear?

3 votes
Accepted

Lebesgue measure of a set of real numbers well-approximated by rationals

3 votes

Difficulty in proving a result based on linear transformation

2 votes

Why if $U$ is open in $\overline {\Bbb R}$ then $U\cap \Bbb R$ is open in $\Bbb R$ in this proof?

2 votes

Understanding Corollary 12 on pg.83 in Royden 4th edition.

2 votes

Expected value in term of characteristic function

2 votes

How to find the length of an unfolded piece of paper which has been folded by its diagonal?

2 votes

finding bijection such that $|\{ x\in A : x \neq f(x)\}| =\mathfrak{c} $

2 votes

Functions $f(x)$ for which the set of functions $af(x+b)$ is closed under addition

2 votes
Accepted

The limit points of a sequence $a_n=\sin(2\pi{rn})$ r is a irrational number

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