Thisvolumecontainstheinvitedandregularpaperspresentedat TCS 2010,the 6thIFIP International Conference on Theoretical Computer Science, organised by IFIP Tech- cal Committee 1 (Foundations of Computer Science) and IFIP WG 2.2 (Formal - scriptions of Programming Concepts) in association with SIGACT and EATCS. TCS 2010 was part of the World Computer Congress held in Brisbane, Australia, during September 20 23, 2010 ( ). TCS 2010 is composed of two main areas: (A) Algorithms, Complexity and Models of Computation, and (B) Logic, Semantics, Speci?cation and Veri?cation. The selection process led to the acceptance of 23 papers out of 39 submissions, eachofwhichwasreviewedbythreeProgrammeCommitteemembers.TheProgramme Committee discussion was held electronically using Easychair. The invited speakers at TCS 2010 are: Rob van Glabbeek (NICTA, Australia) Bart Jacobs (Nijmegen, The Netherlands) Catuscia Palamidessi (INRIA and LIX, Paris, France) Sabina Rossi (Venice, Italy) James Harland (Australia) and Barry Jay (Australia) acted as TCS 2010 Chairs. We take this occasion to thank the members of the Programme Committees and the external reviewers for the professional and timely work; the conference Chairs for their support; the invited speakers for their scholarly contribution; and of course the authors for submitting their work to TCS 2010.

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Convexity, Duality and Effects.- A Calculus for Power-Aware Multicast Communications in Ad Hoc Networks.- The Coarsest Precongruences Respecting Safety and Liveness Properties.- Entropy and Attack Models in Information Flow.- Safe Equivalences for Security Properties.- On Probabilistic Alternating Simulations.- Probabilistic Mobility Models for Mobile and Wireless Networks.- On Packing Splittable Items with Cardinality Constraints.- Deterministic Computations in Time-Varying Graphs: Broadcasting under Unstructured Mobility.- Slicing Behavior Tree Models for Verification.- Optimization of the Anisotropic Gaussian Kernel for Text Segmentation and Parameter Extraction.- Online Dictionary Matching for Streams of XML Documents.- The Duality of Computation under Focus.- Polarized Resolution Modulo.- A Logic on Subobjects and Recognizability.- Terminating Tableaux for with Number Restrictions on Transitive Roles.- Proof System for Applied Pi Calculus.- Concurrent Pattern Calculus.- Initial Segment Complexities of Randomness Notions.- Topologies Refining the Cantor Topology on X ? .- On Symbolic Representations of Maximum Matchings and (Un)directed Graphs.- Traceable Sets.- Approximating the Non-contiguous Multiple Organization Packing Problem.- Improving the Competitive Ratios of the Seat Reservation Problem.- A Semiring-Based Trace Semantics for Processes with Applications to Information Leakage Analysis.- A Game-Theoretic Approach to Routing under Adversarial Conditions.- An Operational Model for Multiprocessors with Caches.