2 problems

Let $\overline{\operatorname{M}}_{g,n}$ be the moduli space of stable $n$-pointed curves of genus $g$, and let a boundary stratum mean an irreducible component of the locus of stab…

Let $\mathcal{G}_n$ be the formal graph algebra on graphs with $n$ legs, without genus assignments, and let … be the homomorphism sending a graph to its genus-free boundary class.…