Keywords. Engel structure, prolongation, Legendrian foliation
AMS subject classification. Primary: 57R25. Secondary: 58A17, 58A30, 53C15.
Submitted: 12 March 2002. Accepted: 22 March 2002. Published: 11 April 2002.
Department of Mathematics, Osaka University
Toyonaka Osaka 560-0043, Japan
Department of Mathematics, University of Pennsylvania
Philadelphia, PA 19104, USA
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