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okw1124
  • Member for 3 years, 2 months
  • Last seen more than a month ago
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question
6
Does every $4$-connected nonplanar graph contain a $K_5$-minor?
Nov 17, 2021
question
3
If the girth of a $2k$-regular graph $G$ is larger than the diameter of a tree $T$ with $k$ edges, then $G$ is decomposed into copies of $T$
Sep 23, 2021
question
3
Connectivity and the minimum degree of bipartite graph
Oct 7, 2021
question
3
What kind of graph has more edges than its line graph?
Oct 30, 2021
question
2
Two independent spanning trees of $2$-connected graph
Oct 8, 2021
question
2
Maximum number of leaf blocks in 3-regular (cubic) graph
Oct 10, 2021
question
2
The lower bound of number of vertices covered by maximum matching in $3$-regular graph
Oct 12, 2021
question
1
$K_{k,m}$ is $k$-choosable if and only if $m<k^k$
Oct 24, 2021
question
1
If $G$ and $H$ are $k$-critical, then applying Hajós construction to $G$ and $H$ makes $k$-critical graph
Oct 28, 2021
question
1
Pseudo-replication of a vertex in a perfect graph
Oct 31, 2021
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6
Simple but interesting problem about the binomial coefficient from Olympiad
5
What is the value of $\sum_{n=1}^\infty \frac{1}{F_n F_{n+4}}$ where $F_n$ is nth Fibonacci number?