Robuta

https://arxiv.org/html/1405.2841v3 Finite Embeddability of Sets and Ultrafilters finite embeddability sets ultrafilters https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2021.32 An FPT Algorithm for the Embeddability of Graphs into Two-Dimensional Simplicial Complexes for the two dimensional simplicial complexes fpt algorithm