user avatar
user avatar
user avatar
Alex-Github-Programmer
  • Member for 1 year, 5 months
  • Last seen more than a week ago
10 votes
1 answer
493 views

Calculate $\sum\limits_{i=0}^\infty(2^{2^{(-i)}}-1)$

5 votes
1 answer
142 views

Prove ABC,A'B'C' are congruent:D is on BC,D' is on B'C', $\angle BAD \angle CAD= \angle B'A'D' \angle C'A'D', AB=A'B', AC=A'C', AD=A'D'$

2 votes
2 answers
102 views

For all m there exist n s.t. both 3^i*n±2 are primes for all i<m?

1 vote
1 answer
167 views

Why is $\lim\limits_{x\to\infty}\frac{\sum_{i=1}^x(\sum_{j=1}^i\frac1j-\ln i-\gamma)}{\sum_{i=1}^x\frac1i}=\frac12$?

1 vote
3 answers
86 views

Does the equation $k^k+1=a^2$ have any positive integer solutions? [closed]

1 vote
0 answers
46 views

Turn a Fraction Up and Down but it is Equal to the Original Fraction

1 vote
0 answers
12 views

Initial Points s.t. "Infinite Intersection" Property

0 votes
1 answer
10 views

Straightedge-only for Perpendicularity with a Square

0 votes
1 answer
20 views

Uniform Method for the Calculation to Probabilities and Expectations Limited by Inequalities

0 votes
0 answers
35 views

The number of zeros of function $f(x)={}$ $\sin(x)-m\sin(kx)-n\sin(x-kx)$ on $(0,\pi)$, where $m,n>0$ and $0<k<1$