Indecomposable $1$-factorizations of the complete multigraph $\lambda K_{2n}$ for every $\lambda \le 2n$

Simona Bonvicini, Gloria Rinaldi

A $1$-factorization of the complete multigraph $\lambda K_{2n}$ is said to be indecomposable if it cannot be represented as the union of $1$-factorizations of ${\lambda }_0{K}_{2n}$ and $(λ-λ_0) K_…