Keywords. Compression, flattening, directed embedding, ripple lemma
AMS subject classification. Primary: 57R40, 57R42. Secondary: 57A05.
Submitted to GT on 25 January 2001. (Revised 2 April 2001.) Paper accepted 23 April 2001. Paper published 24 April 2001.
Colin Rourke, Brian Sanderson
Mathematics Institute, University of Warwick
Coventry, CV4 7AL, UK
Email: firstname.lastname@example.org, email@example.com
URL: http://www.maths.warwick.ac.uk/~cpr and ~bjs/
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