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Jul
6
answered Golf Question when you have uneven players teams how can you make it simple and fair
Jul
6
comment Golf Question when you have uneven players teams how can you make it simple and fair
How does the scoring work?
Jul
6
asked 2014 IMC first problem first day (eigenvalues of a product of symmetric matrices).
Jul
6
answered Find all numbers that have 30 factors and have 30 as one of their factors.
Jul
6
comment Number of games required such that two arbitrary players play together and against each at least once.
If there are $2^n$ players we need $n+1$ games. I think this is a good hint, I haven't solved it yet, but I am willing to work through the problem with you.
Jul
6
answered Show that $G:=\mathbb{Z}_{13}^*$ is cyclic
Jul
6
comment Ordering Books On a Shelf
Yes, David is correct.
Jul
6
answered Ordering Books On a Shelf
Jul
6
revised Prove that the graph dual to Eulerian planar graph is bipartite.
added 215 characters in body
Jul
5
comment Prove that the graph dual to Eulerian planar graph is bipartite.
$G''$ is the dual of the dual, it is isomorphic to $G$. It id the second property con the wikipedia page about the dual.en.wikipedia.org/wiki/Dual_graph#Properties
Jul
5
answered Prove that the graph dual to Eulerian planar graph is bipartite.
Jul
5
comment Prove that the graph dual to Eulerian planar graph is bipartite.
It's actually an if and only if. The other direction is simpler. If I recall correctly you need to use the dual of the dual of $G$ is isomorphic to $G$:
Jul
5
comment How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
Yeah, $\lim_{n\to\infty}\frac{n}{n+1}=1$ :)
Jul
5
revised How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
edited body
Jul
5
comment How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
Oh ok I got it. it should be an $i$ instead of an $n$. Thanks
Jul
5
comment How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
$1/2+1/3+1/4+1/5+1/6>1$, I don't see how that claim is possible.
Jul
5
revised How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
added 53 characters in body
Jul
5
revised How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
added 53 characters in body
Jul
5
answered How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
Jul
5
comment How to prove that series $\frac{1}{n+1}$, as $n\to \infty$ is zero.
The series? so you are going to add them? or the sequence?