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# Alexandr V. Kostochka, Reconstructing graphs from smaller subgraphs

## October 10 Thursday @ 4:30 PM - 5:30 PM

Room B232,
IBS (기초과학연구원)

A graph or graph property is *$\ell$-reconstructible* if it is determined by the multiset of all subgraphs obtained by deleting $\ell$ vertices. Apart from the famous Graph Reconstruction Conjecture, Kelly conjectured in 1957 that for each $\ell\in\mathbb N$, there is an integer $n=n(\ell)$ such that every graph with at least $n$ vertices is $\ell$-reconstructible.

We show that for each $n\ge7$ and every $n$-vertex graph $G$, the degree list and connectedness of $G$ are $3$-reconstructible, and the threshold $n\geq 7$ is sharp for both properties. We also show that all $3$-regular graphs are $2$-reconstructible.