Contents
Preface vn
On h-Vectors and Symmetry
RON M. ADIN
1
Combinatorial Aspects of the Poincare Polynomial Associated with a
Reflection Group
HELE:NE BARCELO AND ALAIN GOUPIL
21
Partial Unimodality for f- Vectors of Simplicial Polytopes and Spheres
ANDERS BJORNER
45
Polyominoes and Polygons
MIREILLE BOUSQUET-MELOU
55
Log-Concave and Unimodal Sequences in Algebra, Combinatorics, and
Geometry: An Update
FRANCESCO BRENT!
71
A Fine Classification of Closed Planar Sets According to Their Non-seeing
Property
ZIVA DEUTSCH
91
On the Skeleton of the Dual Cut Polytope
ANTOINE DEZA AND MICHEL DEZA
101
A High-School Algebra, "Formal Calculus," Proof of the Bieberbach
Conjecture [After
L.
Weinstein]
SHALOSH B. EKHAD AND DORON ZEILBERGER
113
Node Firing Games on Graphs
KIMMO ERIKSSON
117
Combinatorial Presentation of the Structure Constants of the Center of the
Group Algebra of 6
n
ALAIN GOUPIL
129
Abstract Rigidity in m-Space
JACK E. GRAVER, BRIGITTE SERVATIUS, AND HERMAN SERVATIUS
145
A Meshing Technique for de Bruijn Tori
GLENN HURLBERT AND GARTH ISAAK
153
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