Mathematical Foundations of Computer Science 2001

This volume contains papers selected for presentation at the 26th International Symposium on Mathematical Foundations of Computer Science MFCS 2001, held in Mari ansk eL azn?e, Czech Republic, August 27 31, 2001. MFCS 2001 was organized by the Mathematical Institute (Academy of S- ences of the Czech Republic), the Institute for Theoretical Computer Science (Charles University, Faculty of Mathematics and Physics), the Institute of C- puter Science (Academy of Sciences of the Czech Republic), and Action M Agency. It was supported by the European Research Consortium for Informatics and Mathematics, the Czech Research Consortium for Informatics and Ma- ematics, and the European Association for Theoretical Computer Science. We gratefully acknowledge the support of all these institutions. The series of MFCS symposia, organized on a rotating basis in Poland, S- vakia, and the Czech Republic, has a well-established tradition. The aim is to encourage high-quality research in all branches of theoretical computer science and bring together specialists who do not usually meet at specialized confer- ? ences. Previous meetings tookplace in Jablonna, 1972; Strbsk e Pleso, 1973; J- wisin, 1974; Marian sk eL azn?e, 1975; Gdan sk, 1976; Tatransk a Lomnica, 1977; Za- ? kopane, 1978; Olomouc, 1979; Rydzina, 1980; Strbsk e Pleso, 1981; Prague, 1984; Bratislava, 1986; Karlovy Vary, 1988; Porabk a-Kozubnik, 1989; Bansk aBystrica, 1990; Kazimierz Dolny, 1991; Prague, 1992; Gdan sk, 1993; Ko?sice, 1994; Prague, 1995; Krak ow, 1996; Bratislava, 1997; Brno, 1998; Szklarska Por eba, 1999; and Bratislava, 2000.

Includes supplementary material: sn.pub/extras

Inhalt
Invited Talks.- A New Category for Semantics.- On Implications between P-NP-Hypotheses: Decision versus Computation in Algebraic Complexity.- Playing Games with Algorithms: Algorithmic Combinatorial Game Theory.- Some Recent Results on Data Mining and Search.- Hypertree Decompositions: A Survey.- The Strength of Non-size-increasing Computation (Introduction and Summary).- to Recent Quantum Algorithms.- Decomposition Methods and Sampling Circuits in the Cartesian Lattice.- New Algorithms for k-SAT Based on the Local Search Principle.- Linear Temporal Logic and Finite Semigroups.- Contributed Talks.- Refined Search Tree Technique for Dominating Set on Planar Graphs.- The Computational Power of a Family of Decision Forests.- Exact Results for Accepting Probabilities of Quantum Automata.- Improved Bounds on the Weak Pigeonhole Principle and Infinitely Many Primes from Weaker Axioms.- Analysis Problems for Sequential Dynamical Systems and Communicating State Machines.- The Complexity of Tensor Circuit Evaluation.- Computing Reciprocals of Bivariate Power Series.- Automatic Verification of Recursive Procedures with One Integer Parameter.- Graph-Driven Free Parity BDDs: Algorithms and Lower Bounds.- Computable Versions of Baire's Category Theorem.- Automata on Linear Orderings.- Algorithmic Information Theory and Cellular Automata Dynamics.- The k-Median Problem for Directed Trees.- On Pseudorandom Generators in NC0.- There Are No Sparse NPw-Hard Sets.- Sharing One Secret vs. Sharing Many Secrets: Tight Bounds for the Max Improvement Ratio.- (H,C,K) -Coloring: Fast, Easy, and Hard Cases.- Randomness and Reductibility.- On the Computational Complexity of Infinite Words.- Lower Bounds for On-Line Single-Machine Scheduling.- Approximation Algorithms and Complexity Results forPath Problems in Trees of Rings.- A 3-Approximation Algorithm for Movement Minimization in Conveyor Flow Shop Processing.- Quantifier Rank for Parity of Embedded Finite Models.- Space Hierarchy Theorem Revised.- Converting TwoWay Nondeterministic Unary Automata into Simpler Automata.- The Complexity of the Minimal Polynomial.- Note on Minimal Finite Automata.- Synchronizing Finite Automata on Eulerian Digraphs.- A Time Hierarchy for Bounded One-Way Cellular Automata.- Checking Amalgamability Conditions forCasl Architectural Specifications.- On-Line Scheduling with Tight Deadlines.- Complexity Note on Mixed Hypergraphs.- News from the Online Traveling Repairman.- Word Problems for 2-Homogeneous Monoids and Symmetric Logspace.- Variations on a Theorem of Fine & Wilf.- Upper Bounds on the Bisection Width of 3- and 4-Regular Graphs.- Satisfiability of Systems of Equations over Finite Monoids.- Rational Graphs Trace Context-Sensitive Languages.- Towards Regular Languages over Infinite Alphabets.- Partial Information and Special Case Algorithms.- The Complexity of Computing the Number of Self-Avoiding Walks in Two-Dimensional Grid Graphs and in Hypercube Graphs.- From Bidirectionality to Alternation.- Syntactic Semiring of a Language.- On Reducibility and Symmetry of Disjoint NP-Pairs.- Hierarchy of Monotonically Computable Real Numbers.- On the Equational Definition of the Least Prefixed Point.- On the Periods of Partial Words.- The Size of Power Automata.- On the Approximability of the Steiner Tree Problem.- Alignment between Two RNA Structures.- Characterization of Context-Free Languages with Polynomially Bounded Ambiguity.