Zero-sum flows for Steiner triple systems

S. Akbari, A. C. Burgess, P. Danziger +1

Given a $2$-$(v,k,\lambda )$ design, $\mathcal{S}=(\mathcal{X},\mathcal{B})$, a {\it zero-sum $n$-flow} of $\mathcal{S}$ is a map $f:\mathcal{B}⟶\{\pm 1,\dots ,\pm (n-1)\}$ such that for any poi…