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A remark on the Higman–Neumann–Neumann embedding theorem
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