user avatar
user avatar
user avatar
joriki
  • Member for 11 years, 5 months
  • Last seen more than a month ago
45 votes
5 answers
2k views

How to evaluate $\int_0^1\frac{\log^2(1+x)}x\mathrm dx$?

34 votes
2 answers
6k views

necessary and sufficient condition for trivial kernel of a matrix over a commutative ring

25 votes
1 answer
6k views

A proof of Wolstenholme's theorem

22 votes
2 answers
856 views

an integer sum of products of tangents

18 votes
5 answers
2k views

Generalised inclusion-exclusion principle

17 votes
1 answer
755 views

At what rate does the entropy of shuffled cards converge?

16 votes
2 answers
788 views

Arnol'd's trivium problem #68

16 votes
3 answers
2k views

What's up with Plouffe's inverter? Is there an alternative?

15 votes
3 answers
606 views

definite and indefinite sums and integrals

13 votes
1 answer
447 views

Can we qualitatively predict the strategy of the German and US teams in today's World Cup soccer match?

13 votes
2 answers
257 views

Why are all subset sizes equiprobable if elements are independently included with probability uniform over $[0,1]$?

12 votes
4 answers
378 views

The case of the missing ninth of a $2$€ coin

12 votes
2 answers
351 views

Why do the triangular numbers initially form long cycles mod $2^k$?

12 votes
2 answers
542 views

Does the Riemann hypothesis guarantee that integer factorization is difficult?

10 votes
1 answer
3k views

variable bounds on definite integrals in Wolfram|Alpha

10 votes
1 answer
362 views

What is the minimal isoperimetric ratio of a polyhedron with $5$ vertices?

9 votes
1 answer
392 views

expansion of $\int_0^\infty\left(\frac{\sin t}t\right)^p\mathrm dt$ in inverse powers of $p$

9 votes
1 answer
750 views

How is the number of points in the convex hull of five random points distributed?

8 votes
1 answer
252 views

A lawn, a flower, a pipe and the neighbours

8 votes
1 answer
218 views

Probability that one part of a randomly cut equilateral triangle covers the other

7 votes
0 answers
363 views

Is there a connection between the 3D random walk constant and the partition function?

6 votes
1 answer
473 views

What's the probability for two points to lie on the same side of the line joining two other points?

6 votes
2 answers
113 views

How to refer to the "sign" of the dependence of events?

6 votes
0 answers
155 views

Probability that one part of a randomly cut equilateral triangle covers the other without flipping

6 votes
0 answers
175 views

Coupon collection with trading of doubles

6 votes
2 answers
708 views

Probability that a stick randomly broken in three places can form a triangle

6 votes
1 answer
116 views

Succinct proof that $\frac\pi4+\frac\pi6+\log2\gt2$

6 votes
1 answer
154 views

What is the expected volume of the simplex formed by $n+1$ points independently uniformly distributed on $\mathbb S^{n-1}$?

5 votes
0 answers
99 views

More elegant derivation of the shift in median bin occupancy

5 votes
0 answers
175 views

Symmetric proof for the probability of real roots of a quadratic with exponentially distributed parameters