2 problems

Let $K_{\ell m}$ be the complete graph on $\ell m$ vertices. A cyclic two-factorization is a two-factorization invariant under a cyclic group acting regularly on the vertices; a fa…

Hamilton–Waterloo existence conjecture. If $k\equiv 2\pmod 4$ and $s>0$, then an $HW(n;r,s;n,k)$ exists if and only if