CONTENTS
LASZLO BABAI, THOMAS P. HAYES, PETER G. KIMMEL: The cost of the missing bit: communication complexity with help . . . 455 CHRISTIAN HOUDRE: Mixed and isoperimetric estimates on the log-Sobolev
constants of graphs and Markov chains . . . 489 ALEXANDR V. KOSTOCHKA, DOUGLAS R. WOODALL: Density conditions
for panchromatic colourings of hypergraphs . . . 515 MONIQUE LAURENT: On the sparsity order of a graph and its deficiency in
c h o r d a l i t y . . . 543 GUGLIELMO LUNARDON: Linear fc-blocking s e t s . . . 571 ROMAN NEDELA, MARTIN SKOVIERA: Cayley snarks and almost simple
g r o u p s . . . 583 YONUTZ V. STANdtHESCU: An upper bound for d-dimensional difference sets 591