***************************************************************************** Call for Papers SPECIAL ISSUE OF DISCRETE MATHEMATICS ***************************************************************************** The journal Discrete Mathematics will publish a Special Issue in honor of the 65th birthday of Daniel J. Kleitman. The issue also commemorates the conference held in his honor at MIT (16-18 August, 1999). SCOPE OF THE ISSUE: Kleitman's contributions within combinatorics span a wide range of topics including extremal graph and hypergraph theory, partially ordered sets, combinatorial geometry, combinatorial number theory, asymptotic enumeration, and combinatorial algorithms. We invite the submission of original research articles spanning these and related areas. Submissions based on lectures or posters given at the conference are warmly encouraged, but the only needed connection to the conference is a desire to honor Dan Kleitman. REFEREEING: The contributions will be subject to the usual strict refereeing standards of Discrete Mathematics. SUBMISSION DEADLINE: 15 October, 1999 You may submit your contribution by e-mail as a LaTeX file to one of the following e-mail addresses: cowen@mts.jhu.edu, griggs@math.sc.edu, west@math.uiuc.edu or as a hardcopy (4 copies) by regular (air)mail to Douglas B. West Department of Mathematics University of Illinois at Urbana-Champaign 1409 W. Green Street Urbana, Illinois 61801-2975 If you submit electronically, we would be grateful if you could also send a hardcopy to the above address. Looking forward to your contribution, L. Cowen, J. Griggs, D. West Guest Editors DM