Keywords. Amalgamated free product, splitting, intersection number, ends
AMS subject classification. Primary: 20E06, 20E08. Secondary: 20F32, 57M07.
Submitted to GT on 18 May 1999. (Revised 6 April 2000.) Paper accepted 24 July 2000. Paper published 9 August 2000.
Peter Scott, Gadde A Swarup
Mathematics Department, University of Michigan
Ann Arbor, Michigan 48109, USA
Mathematics Department, University of Melbourne
Parkville, Victoria 3052, Australia
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