List of accepted papers for ICALP 2009: TRACK A: Erik D. Demaine, Gad Landau and Oren Weimann. On Cartesian Trees and Range Minimum Queries Oren Weimann and Raphael Yuster. Computing the Girth of a Planar Graph in O(n log n) Time Ning Chen, Nicole Immorlica, Anna Karlin, Mohammad Mahdian and Atri Rudra. Approximating Matches Made in Heaven Andre Nies. Superhighness and strong jump traceability Nikhil Bansal, Ho-Leung Chan and Kirk Pruhs. Improved Bounds for Speed Scaling in Devices Obeying the Cube-Root Rule Erik D. Demaine, MohammadTaghi Hajiaghayi and Philip Klein. Node-weighted Steiner Tree and Group Steiner Tree in Planar Graphs Julien Cl?ment, Brigitte Vallee, Philippe Flajolet and James Allen Fill. The Number of Symbol Comparisons in Quicksort and Quickselect Amin Coja-Oghlan. A better algorithm for random k-SAT Klaus Jansen. An EPTAS for scheduling jobs on uniform processors: using an MILP relaxation with a constant number of integral variables Michael Fellows, Fedor Fomin, Daniel Lokshtanov, Elena Losievskaja, Frances A. Rosamond and Saket Saurabh. Distortion is Fixed Parameter Tractable Sudipto Guha and Zhiyi Huang. Revisiting the Direct Sum Theorem and Space Lower Bounds in Random Order Streams Amit Chakrabarti, Graham Cormode and Andrew McGregor. Annotations in Data Streams Chrisil Arackaparambil, Joshua Brody and Amit Chakrabarti. Functional Monitoring Without Monotonicity Kazuyuki Amano. Bounds on the Size of Small Depth Circuits for Approximating Majority Hiroki Morizumi. Limiting Negations in Formulas Monaldo Mastrolilli and Ola Svensson. Improved Bounds for Flow Shop Scheduling Yuriy Arbitman, Moni Naor and Gil Segev. De-amortized Cuckoo Hashing: Provable Worst-Case Performance and Experimental Results Yuval Emek, Pierre Fraigniaud, Amos Korman and Adi Rosen. Online Computation with Advice Telikepalli Kavitha, Julian Mestre and Meghana Nasre. Popular Mixed Matchings Mathieu Hoyrup and Cristobal Rojas. Applications of Effective Probability Theory to Martin-Loef Randomness Jesper Nederlof. Fast polynomial-space algorithms using Mobius inversion: Improving on Steiner Tree and related problems Stepan Holub and Dirk Nowotka. The Ehrenfeucht-Silberger Problem Bruno Durand, Alexander Shen and Andrei Romashchenko. High Complexity Tilings with Sparse Errors Eric J Mc Dermid. A 3/2-approximation algorithm for general stable marriage Parikshit Gopalan, Ryan O'Donnell, Rocco Servedio, Amir Shpilka and Karl Wimmer. Testing Fourier dimensionality and sparsity Alexandr Andoni, Piotr Indyk, Krzysztof Onak and Ronitt Rubinfeld. External Sampling Steve Chien and Alistair Sinclair. Strong and Pareto Price of Anarchy in Congestion Games Daniel Golovin. B-Treaps: A Uniquely Represented Alternative to B-Trees Hirotada Kobayashi, Francois Le Gall, Harumichi Nishimura and Martin Roetteler. General Scheme for Perfect Quantum Network Coding with Free Classical Communication Yuli Ye and Allan Borodin. Elimination Graphs Chandra Chekuri and Nitish Korula. A Graph Reduction Step Preserving Element-Connectivity and Applications Nathalie Aubrun and Marie-Pierre B?al. Decidability of conjugacy of tree shifts of finite type Adam Klivans, Phil Long and Rocco Servedio. Learning Halfspaces with Malicious Noise Tak-Wah Lam, Lap-Kei Lee, Hing-Fung Ting, Isaac To and Prudence W.H. Wong. Sleep with Guilt and Work Faster to Minimize Flow plus Energy Philip Bille and Mikkel Thorup. Faster Regular Expression Matching Venkatesan Chakaravarthy, Vinayaka Pandit, Sambuddha Roy and Yogish Sabharwal. Approximating Decision Trees with Multiway Branches Neeraj Kayal and Timur Nezhmetdinov. Factoring groups efficiently Geir Agnarsson, Magn?s M?r Halld?rsson and Elena Losievskaja. SDP-based Algorithms for Maximum Independent Set Problems on Hypergraphs Michael Dom, Daniel Lokshtanov and Saket Saurabh. Incompressibility through Colors and IDs Enav Weinreb, Eyal Kushilevitz and Jan Draisma. Partition Arguments in Multiparty Communication Complexity J?r?mie Roland and Mario Szegedy. Amortized communication complexity of distributions Noga Alon, Daniel Lokshtanov and Saket Saurabh. Fast FAST Beat Gfeller and Peter Sanders. Towards Optimal Range Medians Barna Saha and Samir Khuller. On Finding Dense Subgraphs Erik D. Demaine, MohammadTaghi Hajiaghayi and Ken-ichi Kawarabayashi. Approximation Algorithms via Structural Results for Apex-Minor-Free Graphs Arash Farzan, Rajeev Raman and Srinivasa Rao Satti. Universal representation of Succinct Trees? Marek Cygan and Marcin Pilipczuk. Exact and approximate Bandwidth Omid Amini, Fedor Fomin and Saket Saurabh. Counting Subgraphs via Homomorphisms Nir Ailon and Edo Liberty. Correlation Clustering Revisited: The ``True'' Cost of Error Minimization Problems Mikl?s Ajtai, Vitaly Feldman, Avinatan Hassidim and Jelani Nelson. Sorting and Selection with Imprecise Comparisons Harry Buhrman, Lance Fortnow and Rahul Santhanam. Unconditional Lower Bounds against Advice Arash Farzan and Ian Munro. Dynamic Succinct Ordered Trees Endre Boros and Kazuhisa Makino. A Fast and Simple Parallel Algorithm for the Monotone Duality Problem Ioannis Koutis and Ryan Williams. Limits and applications of group algebras for parameterized problems Sanjeev Arora, David Steurer and Avi Wigderson. Towards a study of low-complexity graphs Robert Elsaesser and Thomas Sauerwald. Tight Bounds for the Cover Time of Multiple Random Walks Harish Chandran, Nikhil Gopalkrishnan and John Reif. The Tile Complexity of Linear Assemblies Luca Becchetti and Elias Koutsoupias. Competitive analysis of aggregate max in windowed streaming Martin Dietzfelbinger and Michael Rink. Applications of a splitting trick Christos Koufogiannakis and Neal Young. Greedy $\degree$-Approximation Algorithm for Covering with Arbitrary Constraints and Submodular Cost Benjamin Doerr, Tobias Friedrich and Thomas Sauerwald. Quasirandom Rumor Spreading: Expanders, Push vs. Pull, and Robustness Magnus M. Halldorsson and Roger Wattenhofer. Wireless Communication is in APX TRACK B: Thomas Place and Luc Segoufin. A decidable characterization of LT on trees Michael Ummels and Dominik Wojtczak. The Complexity of Nash Equilibria in Simple Stochastic Multiplayer Games Ugo Dal Lago and Simone Martini. On Constructor Rewrite Systems and the Lambda-Calculus Jean-Eric Pin and Mario J. J. Branco. Equations defining the polynomial closure of a lattice of regular languages Patricia Bouyer and Vojtech Forejt. Reachability in Stochastic Timed Games Jakub Michaliszyn. Decidability of the Guarded Fragment with the Transitive Closure Naoki Kobayashi and Luke Ong. Complexity of Model Checking Recursion Schemes for Fragments of the Modal Mu-Calculus Vincent Gripon and Olivier Serre. Qualitative Concurrent Games with Imperfect Information Martin Beaudry and Fran?ois Lemieux. Faithful Loops for Aperiodic E-ordered Monoids Philippe Chaput, Vincent Danos, Prakash Panangaden and Gordon Plotkin. Approximating Markov Processes By Averaging Jean-Pierre Jouannaud and Vincent van Oostrom. Diagrammatic Completion Christopher Broadbent. There is no Such Thing as an Inherently Unsafe Word Language Pawel Parys and Igor Walukiewicz. Weak Alternating Timed Automata Christian Dax, Felix Klaedtke and Martin Lange. On Regular Temporal Logics with Past Manuel Bodirsky, Peter Jonsson and Timo von Oertzen. Semilinear Program Feasibility Thomas Colcombet. The theory of stabilization monoids and regular cost functions Sylvie Boldo. Floats & Ropes: a case study for formal numerical program verification Achim Blumensath, Martin Otto and Mark Weyer. Boundedness of monadic second-order formulae over finite words Christel Baier, Nathalie Bertrand, Patricia Bouyer and Thomas Brihaye. When are Timed Automata Determinizable? Lucia Acciai and Michele Boreale. Deciding safety properties in in?nite-state pi-calculus via behavioural types Paul-Andr? Melli?s, Nicolas Tabareau and Christine Tasson. An explicit formula for the free exponential modality of linear logic Lars Kuhtz and Bernd Finkbeiner. LTL Path Checking is Efficiently Parallelizable Thomas Colcombet and Konrad Zdanowski. A Tight Lower Bound for Determinization of Buchi automata Jean Goubault-Larrecq and Alain Finkel. Forward Analysis for WSTS, Part II: Complete WSTS TRACK C: Sudipto Guha and Kamesh Munagala. Multi-armed Bandits with Metric Switching Costs Rosario Pugliese, Francesco Tiezzi and Nobuko Yoshida. On observing dynamic prioritised actions in SOC Damon Mosk-Aoyama and Tim Roughgarden. Worst-Case Efficiency Analysis of Queueing Disciplines Ioannis Chatzigiannakis, Othon Michail and Paul Spirakis. Mediated Population Protocols Kook Jin Ahn and Sudipto Guha. Graph Sparsification in the Semi-streaming Model Flavio Chierichetti, Silvio Lattanzi and Alessandro Panconesi. Rumor Spreading in Social Networks Andrea Clementi, Francesco Pasquale and Riccardo Silvestri. MANETS: High mobility can make up for low transmission power Dariusz Kowalski and Andrzej Pelc. Leader Election in Ad Hoc Radio Networks: a Keen Ear Helps Nitish Korula and Martin Pal. Algorithms for Secretary Problems on Graphs and Hypergraphs Tobias Friedrich, Thomas Sauerwald and Dan Vilenchik. Smoothed Analysis of Balancing Networks Christian Scheideler and Stefan Schmid. A Distributed and Oblivious Heap Aris Anagnostopoulos, Ravi Kumar, Mohammad Mahdian and Eli Upfal. Sort Me If You Can: How to Sort Dynamic Data Rocco De Nicola, Diego Latella, Michele Loreti and Mieke Massink. Rate-based Transition Systems for Stochastic Process Calculi Dimitris Fotakis, Alexis Kaporis and Paul Spirakis. Efficient Methods for Selfish Network Design Colin Cooper, David Ilcinkas, Ralf Klasing and Adrian Kosowski. Derandomizing Random Walks in Undirected Graphs Using Locally Fair Exploration Strategies Rachid Guerraoui and Eric Ruppert. Names Trump Malice: Tiny Mobile Agents Can Tolerate Byzantine Failures Alexander Fanghaenel, Thomas Kesselheim and Berthold Voecking. Improved Algorithms for Latency Minimization in Wireless Networks Constantinos Daskalakis and Christos Papadimitriou. On a Network Generalization of the Minmax Theorem Colin Cooper, Alan Frieze and Tomasz Radzik. Multiple random walks and interacting particle systems Li Zhang. Proportional response dynamics for the Fisher market Yossi Azar, Aleksander Madry, Thomas Moscibroda, Debmalya Panigrahi and Aravind Srinivasan. Maximum Bipartite Flow in Networks with Adaptive Channel Width