Erratum There is an error in this paper. A full erratum will be published in due course. In the meanwhile a provisional erratum is available (links below).
Keywords. Strongly poly-free groups, poly-closed surface groups, Whitehead group, fibered isomorphism conjecture
AMS subject classification. Primary: 19B28, 19A31, 20F99, 19D35. Secondary: 19J10.
Submitted: 25 April 2002. (Revised: 15 January 2003.) Accepted: 7 February 2003. Published: 8 February 2003.
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