2 problems

Let $\Gamma$ be a graph with $r$ interaction sites, and let GOS structures on $\Gamma$ produce surfaces with non-orientable genus. The maximum possible non-orientable genus is $r$.…

Let $\mathcal{T}(Q_1,[\sigma_1])$ and $\mathcal{T}(Q_2,[\sigma_2])$ be theories described by bulk surfaces $\mathcal{S}(Q_i,[\sigma_i])$. Suppose that … Here…