user265554
  • Member for 6 years, 3 months
  • Last seen more than 3 years ago
9 answers
173 votes
19k views
55 bookmarks
There are apparently $3072$ ways to draw this flower. But why?
4 answers
12 votes
347 views
Infinite summation: $x+x+x+x+... =2$?
8 answers
8 votes
48k views
5 bookmarks
1, 5, 9, 13, 17, 21,...
3 answers
7 votes
847 views
What's wrong with this logarithm calculation?
3 answers
5 votes
22k views
2 bookmarks
Area under quarter circle by integration
5 answers
5 votes
322 views
1 bookmarks
How to prove that $(A\cup B)-A = B-(A\cap B)$?
5 answers
5 votes
594 views
Is this limit indeterminate or $e^2$ or what?
1 answers
4 votes
460 views
Do the last digits of powers of a number $n$ follow the same cycle as the last digits of the number $n$'s last digit's powers?
2 answers
4 votes
730 views
How to prove that every power of 6 ends in 6?
3 answers
4 votes
113 views
1 bookmarks
Probability of choosing two real numbers $a$ and $b$ from $[1,4]$ such that $ ab>4$.
2 answers
3 votes
154 views
Why do we know that a set S of sentences implies the sentence A if the union of S and the negation of A is inconsistent?
2 answers
3 votes
568 views
2 bookmarks
How different are the positive and negative numbers?
2 answers
3 votes
2k views
Area of circles inside an equilateral triangle compared to the area of the triangle itself.
2 answers
2 votes
105 views
Non-rigorous limits to infinity trouble
1 answers
2 votes
698 views
1 bookmarks
Does $625!$ have $156$ zeros at the end?
2 answers
2 votes
258 views
1 bookmarks
For each positive integer $a$, does there exist a positive integer $b$ such that $2b^2 + b \gt ab^2$?
2 answers
1 votes
354 views
How should one without any university mathematics background study mathematical logic?
2 answers
1 votes
3k views
How to prove that a number is composite?
2 answers
1 votes
110 views
Can you show that $3n+1$ is not divisible by $5$ using congruences?
2 answers
1 votes
63 views
Something I'm not getting about geometric series.
1 answers
1 votes
251 views
On Mersenne composite numbers (need of a proof).
2 answers
1 votes
481 views
Why are Aleph numbers by definition of the form $2^x$?
3 answers
1 votes
90 views
Induction proof for the sum 1+2+4+8+...
1 answers
1 votes
131 views
Remainder of $7^{220}$ when divided by $8$
1 answers
1 votes
947 views
Sum of strictly increasing functions is strictly increasing
1 answers
1 votes
302 views
Strengthening an inequality
3 answers
1 votes
33 views
1 bookmarks
Remainders and modulars
3 answers
1 votes
134 views
Euclid's proof on the infinity of primes
3 answers
0 votes
43 views
1 bookmarks
The rigorousness of this proof about greatest common divisors.
3 answers
0 votes
492 views
Sheep and grass problem