OFFSET
0,2
COMMENTS
An antichain is a set of sets, none of which is a subset of any other.
The vertex-connectivity of a set-system is the minimum number of vertices that must be removed (along with any resulting empty edges) to obtain a non-connected set-system or singleton. Note that this means a single node has vertex-connectivity 0.
EXAMPLE
Triangle begins:
1
2 0
4 1 0
9 3 2 0
29 14 10 6 0
209 157 128 91 54 0
CROSSREFS
KEYWORD
AUTHOR
Gus Wiseman, Sep 26 2019
STATUS
approved