%0 Journal Article
%T The adjunction problem over torsion-free groups
%A Max Forester
%A Colin Rourke
%J Mathematics
%D 2004
%I arXiv
%R 10.1073/pnas.0502940102
%X In this note we prove injectivity and relative asphericity for "layered" systems of equations over torsion-free groups, when the exponent matrix is invertible over Z. We also give elementary geometric proofs of results due to Bogley-Pride and Serre that are used in the proof of the main theorem.
%U http://arxiv.org/abs/math/0412274v2