JMoravitz's user avatar
JMoravitz's user avatar
JMoravitz's user avatar
JMoravitz
  • Member for 9 years, 5 months
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29 votes
3 answers
3k views

When is $\binom{2n}{n}\cdot \frac{1}{2n}$ an integer?

11 votes
2 answers
2k views

Every simple planar graph with $\delta\geq 3$ has an adjacent pair with $\deg(u)+\deg(v)\leq 13$

7 votes
2 answers
984 views

Proving $(\Bbb R,+)$ has no proper subgroup isomorphic to itself

7 votes
1 answer
234 views

Intended solution to proving $1994\mid 10^{900}-2^{1000}$ other than $1994\mid 10^{9k}-2^{10k}$

6 votes
1 answer
270 views

How to pronounce Stirling Numbers of Second Kind ${n\brace k}$?

5 votes
1 answer
383 views

Probability of consecutive floors on an elevator with more people

4 votes
2 answers
3k views

Is there an accepted term for the opposite of mode in statistics?

3 votes
3 answers
275 views

Inequality leading to Holder's: $t^\theta \leq \theta t + 1 - \theta$ with $0<\theta<1$ and $t\geq 0$

2 votes
3 answers
177 views

Limit of $\lim_{x\to\infty} (1+\frac{f(x)}{x})^x$ for $f(x) = o(x)$

2 votes
2 answers
4k views

Eigenvalues of Left Shift + Right Shift in $l_2([0,\infty))$

1 vote
1 answer
1k views

Product of RREF versus RREF of product