A remark on the Higman–Neumann–Neumann embedding theorem

Simon Thomas
2009 Journal of group theroy  
There does not exist an isomorphism-invariant Borel version of the Higman-Neumann-Neumann embedding theorem. The author's research is partially supported by NSF Grants DMS 0600940.
doi:10.1515/jgt.2008.097 fatcat:tchuvovvhne7zfdyjvacqugt7a