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amakelov
  • Member for 8 years, 5 months
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15 votes
Accepted

Why is the Topology of a Graph called a "Topology"?

13 votes

supremum of expectation $\le$ expectation of supremum?

13 votes

Linear Transformation with kernel equal to image

12 votes

Lipschitz implies bounded gradient

8 votes
Accepted

Prove or disprove: The minimum number of transpositions needed to decompose $\sigma$ is $n-S$.

7 votes
Accepted

Topology, closure definition - well defined?

7 votes
Accepted

A Pigeonhole-Principle from IMO Shortlist.

7 votes

Prove that any set of $3n+1$ numbers taken from $\{1,2,...,4n\}$ contains three different numbers $a$, $b$, $c$ such that $a|b$ and $b|c$.

6 votes
Accepted

Change in eigenvalues when rank-1 matrix is added to positive definite matrix

5 votes

Why does the Number of Graphs on $n$ Vertices Blow up so Quickly?

5 votes

Prove or disprove there exists a set of four numbers out of the $48$ positive integers of which product is a perfect square

5 votes
Accepted

Why some inverse functions do not have a closed form

5 votes
Accepted

Proximal Operator of Weighted $ {L}_{2} $ Norm

4 votes
Accepted

Explain why $\prod_\limits{n=N}^{M}\{1-P(A_n)\}\leqslant\prod_\limits{n=N}^{M}e^{-P(A_n)}$

4 votes
Accepted

Find the probability that a word with 15 letters (selected from P,T,I,N) does not contain TINT

4 votes

What is the range of $λ$?

4 votes
Accepted

There exists a vector $c\in C$ with $c\cdot b=1$

4 votes

Let $(p_n)_{n \in \mathbb{N}}$ be the sequence of prime numbers, then $\lim_{n \to \infty}\frac{p_{n+1}}{p_n} = 1$?

4 votes
Accepted

Is there a structured way to make convex functions strictly convex?

3 votes

Can we represent matrix $\ A_{2x2}$ like this $\ A=\lambda_1R_1+\lambda_2R_2$

3 votes
Accepted

Question about skew-symmetric linear operator.

3 votes

Number Theory: How to prove this statement?

3 votes
Accepted

Function that maps prime numbers to prime numbers

3 votes
Accepted

Triangle inequality for a metric on the space of lines through the origin

3 votes
Accepted

Proof of a theorem about finite dimensional normed linear spaces

3 votes

Proof that plane with $N$ lines can be painted with two colors so that any two neighboring regions are painted in different colors

3 votes
Accepted

Prove that row space and null space of the same matrix do not contain the same nonzero vector.

3 votes

Find the number of elements of set $M$ having: $\forall A, B \in M$ there is $C \in M$ such that the triangle $ABC$ is equilateral

3 votes
Accepted

Finding the formula for the sequence $\sqrt[3]{4} ,\sqrt[3]{4\cdot\sqrt[3]{4}},\sqrt[3]{4\cdot\sqrt[3]{4\cdot \sqrt[3]{4}}} , \cdots $

3 votes
Accepted

Convergence of $h(w) = \sum\limits_{n = 1}^{\infty} \frac1n + \frac1{w - n}$