Discrete Mathematics Volume 241, Numbers 1-3, 28 October 2001 Contents D.G. Rogers Helge Tverberg—A celebration of a life in mathematics Mathematica! publications of Helge Tverberg H. Tverberg A combinatorial mathematician in Norway: some personal reflections Contributions A. Asinowski, A. Holmsen and M. Katchalski The triples of geometric permutations for families of disjoint translates D. Avis, K. Hosono and M. Urabe On the existence of a point subset with a specified number of interior points |. Barany and Z. Furedi On the lattice diameter of a convex polygon A.|. Barbero and O. Ytrehus On the bit oriented trellis structure of run length limited codes on discrete local data dependent channels E. Barcucci, S. Brunetti, A.D. Lungo and M. Nivat Reconstruction of lattice sets from their horizontal, vertical and diagonal X-rays J.A. Barker and D.G. Larman Determination of convex bodies by certain sets of sectional volumes A. Bezdek, F. Fodor and |. Talata Sylvester-type theorems for unit circles T. Bisztriczky and K. Bor6éczky Jr. On periodically-cyclic Gale 4-polytopes U. Blass, |. Honkala and S. Litsyn Bounds on identifying codes A. Bonnecaze, P. Sole and P. Udaya Tricolore 3-designs in Type Ill codes M. Bunder and K. Tognetti On the self matching properties of [j z] Discrete Mathematics Volume 241, Numbers 1-3, 28 October 2001 Contents D.G. Rogers Helge Tverberg—A celebration of a life in mathematics Mathematica! publications of Helge Tverberg H. Tverberg A combinatorial mathematician in Norway: some personal reflections Contributions A. Asinowski, A. Holmsen and M. Katchalski The triples of geometric permutations for families of disjoint translates D. Avis, K. Hosono and M. Urabe On the existence of a point subset with a specified number of interior points |. Barany and Z. Furedi On the lattice diameter of a convex polygon A.|. Barbero and O. Ytrehus On the bit oriented trellis structure of run length limited codes on discrete local data dependent channels E. Barcucci, S. Brunetti, A.D. Lungo and M. Nivat Reconstruction of lattice sets from their horizontal, vertical and diagonal X-rays J.A. Barker and D.G. Larman Determination of convex bodies by certain sets of sectional volumes A. Bezdek, F. Fodor and |. Talata Sylvester-type theorems for unit circles T. Bisztriczky and K. Bor6éczky Jr. On periodically-cyclic Gale 4-polytopes U. Blass, |. Honkala and S. Litsyn Bounds on identifying codes A. Bonnecaze, P. Sole and P. Udaya Tricolore 3-designs in Type Ill codes M. Bunder and K. Tognetti On the self matching properties of [j z] B. Chen, S.-T. Yau and Y.-N. Yeh Graph homotopy and Graham homotopy W. Chen and T. Klove On the second greedy weight for linear codes of dimension 3 A. Daneshgar, A.J.W. Hilton and P.D. Johnson Jr. Relations among the fractional chromatic, choice, Hall, and Hall-condition numbers of simple graphs D.E. Daykin On deleting coordinates from integer vectors M. de Longueville Notes on the topological Tverberg theorem E. Deutsch A bijective proof of the equation linking the Schroder numbers, large and small E. Deutsch and L. Shapiro A survey of the Fine numbers J. Eckhoff A partition theorem of Tverberg-type for boxes in R° H. Eriksson, K. Eriksson, J. Karlander, L. Svensson and J. Wastlund Sorting a bridge hand S. Felsner and G.M. Ziegler Zonotopes associated with higher Bruhat orders B. Grunbaum and G.C. Shephard Isohedra with dart-shaped faces B. Gruinbaum and J. Zaks Convexification of polygons by flips and by flipturns A.J.W. Hilton, F.C. Holroyd and C. Zhao The Overfull Conjecture and the Conformability Conjecture A. Holme A combinatorial proof of the duality defect conjecture in codimension 2 O. Iden On subplanes of free planes D.P. Jacobs and R.E. Jamison A note on equal unions in families of sets C. Kirfel and 0.J. Radseth On the primality of 2h:3"+1 H. Martini and A. Schébel Median and center hyperplanes in Minkowski spaces—a unified approach J. Pach and G. Tardos Separating convex sets by straight lines E. Pergola Two bijections for the area of Dyck paths H.G. Schaathun Upper bounds on weight hierarchies of extremal non-chain codes S. Seo A pairing of the vertices of ordered trees D.-J. Shin, P.V. Kumar and T. Helleseth 5-Designs from the lifted Golay code over Z, via an Assmus-Mattson type approach Author index to volume 241