# Sh:1217

• Asgharzadeh, M., Golshani, M., & Shelah, S. Graphs represented by Ext. Preprint. arXiv: 2110.11143
• Abstract:
Daniel Herden asked for which graph (\mu,R) we can find a family \{G_\alpha\} of Abelian groups such that Ext(G_\alpha,G_\beta) = 0 iff (\alpha,\beta) \in R. We show that this is always possible for bipartite graphs in ZFC. We also give a consistent positive answer for the general case.
• Version 2021-10-14 (32p)
Bib entry
@article{Sh:1217,
}