Resumen de A universal ribbon surface in $B^{4}$

Riccardo Piergallini, Daniele Zuddas

• We construct an orientable ribbon surface $F \subset B^4$ which is universal in the following sense: any orientable 4-manifold $M \cong B^4 \cup \text{1-handles} \cup \text{2-handles}$ can be represented as a cover of $B^4$ branched over $F$.