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A. Pongrácz
  • Member for 3 years, 11 months
  • Last seen more than a month ago
  • Debrecen, Hungary
38 votes
Accepted

Integer solutions to $x^3=y^3+2y+1$?

37 votes

Optimal strategy for cutting a sausage?

24 votes
Accepted

Super hard system of equations

16 votes

What is $\log(n+1)-\log(n)$?

11 votes

Every finite commutative ring with no zero divisors contains a multiplicative identity?

11 votes

Smallest cube ending in $2017$

10 votes
Accepted

Simulating a fair coin toss using a biased coin in fixed number of tosses

9 votes

How to simplify $\int{\sqrt[4]{1-8{{x}^{2}}+8{{x}^{4}}-4x\sqrt{{{x}^{2}}-1}+8{{x}^{3}}\sqrt{{{x}^{2}}-1}}dx}$?

8 votes
Accepted

Calculate, $f\bigg(\frac{1}{1997}\bigg)+f\bigg(\frac{2}{1997}\bigg)+f\bigg(\frac{3}{1997}\bigg)\ldots f\bigg(\frac{1996}{1997}\bigg)$

7 votes
Accepted

Comparison of no. of abelian groups of order $p^r$ with that of order $q^r$

7 votes
Accepted

Find all value of integers n for which the expression is a perfect square.

6 votes
Accepted

Existence of finitely presented group with exactly $k$ subgroups?

6 votes
Accepted

How many homomorphisms from $\mathbb Z_4$ to $S_4$?

6 votes
Accepted

Charged particles

6 votes

Is the double series $\sum_{n,k\geq 1}\frac{1}{n^2+k^2}$ divergent?

6 votes
Accepted

Is the domain of convergence of a sequence of measurable functions measurable? (general targets)

6 votes
Accepted

Expected value: Is $E|X| = |E(X)|$?

5 votes
Accepted

prove $f$ is bounded given $f(t^2+u)=tf(t)+f(u)$

5 votes
Accepted

What is the probability that there will be no matching pairs of shoes in the sample?

5 votes
Accepted

How many pairs $(p, m)$ exist, where $p$ is a prime and $m$ is an integer, such that $\frac{m^3-pm+1}{m^2+pm+2}$ is an integer.

5 votes

Compute $\lim_{n\to\infty}\frac{\tfrac{n}{1}+\tfrac{n-1}{2}+\dots+\tfrac{2}{n-1}+\tfrac{1}{n}}{\ln(n!)}$

5 votes
Accepted

Is the image of a Null set is still a Null set under a differentiable function whose derivative is bounded?

5 votes

triangles in $\mathbb{R}^n$ with all vertices in $\mathbb{Q}^n$

5 votes
Accepted

Whats the lowest multiple of $99$ that has digits of only $0, 1$, and $ 2$

5 votes
Accepted

Does there exist a nearly immaculate group not of the form $C_{2^n}$?

4 votes

System of equations has no solution

4 votes

How long until a random word with letters "A", "B", "C" ends in the pattern "ABC"?

4 votes
Accepted

Can we prove the inequality without opening the parentheses? $(x+y+z)(xy+yz+xz)(x^2+y^2+z^2)≥6(x^2+y^2+z^2)+3(xy+yz+xz)$

4 votes
Accepted

Does there exist some sort of classification of finite "characteristically simple" groups?

4 votes

Solve the equation $\frac{\sqrt {3}}{2}\sin(x) -\cos x=\cos^2x$

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