The authors fix their Euclidean factor theorem for CAT(0) lattices: a lattice always commensurates a free abelian subgroup whose rank equals the Euclidean dimension, and finite generation or residual finiteness recovers the original splitting.
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Erratum and addenda to "Isometry groups of non-positively curved spaces: discrete subgroups"
The authors fix their Euclidean factor theorem for CAT(0) lattices: a lattice always commensurates a free abelian subgroup whose rank equals the Euclidean dimension, and finite generation or residual finiteness recovers the original splitting.