Keywords. 4-manifolds, smooth h-cobordisms, surgery
AMS subject classification. Primary: 57R80. Secondary: 57N13, 57Q20, 55N45.
Submitted to GT on 20 October 2000. (Revised 9 January 2001.) Paper accepted 12 January 2001. Paper published 14 January 2001.
Mathematisches Institut, Universitat Heidelberg
69120 Heidelberg, Federal Republic of Germany
Mathematisches Forschungsinstitut Oberwolfach
77709 Oberwolfach, Federal Republic of Germany
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