Keywords. 4-manifolds, gropes, pi_1-null immersions, link homotopy
AMS subject classification. Primary: 57N13. Secondary: 57M25, 57N35, 57N70.
Submitted to GT on 27 June 2000. Paper accepted 3 November 2000. Paper published 10 November 2000.
Vyacheslav S Krushkal
Department of Mathematics, Yale University
New Haven, CT 06520-8283, USA
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