On graphs without cycles of length 0 modulo 4

Ervin Győri, Binlong Li, Nika Salia +3

Bollobás proved that for every $k$ and $\ell$ such that $k\mathbb{Z}+\ell$ contains an even number, an $n$-vertex graph containing no cycle of length $\ell \mathrm{mod}k$ can contain at…