Virtual surface bundle groups and Johnson's trichotomy
J. A. Hillman
Research Report 98-8
Date: 27 March 1998
We give a new exposition of Johnson's trichotomy for torsion free groups
which are virtually extensions of one surface group by another,
and show that all groups in his first two classes may be realized by
aspherical closed smooth 4-manifolds.
aspherical. bundle. extension. 4-manifold. orbifold. surface.
AMS Subject Classification (1991)
Secondary: 20F34 20J05
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Sydney Mathematics and Statistics