By Robert Harper (auth.), Josep Díaz, Juhani Karhumäki, Arto Lepistö, Donald Sannella (eds.)

This publication constitutes the refereed lawsuits of the thirty first foreign Colloquium on Automata, Languages and Programming, ICALP 2004, held in Turku, Finland, in July 2004.

The ninety seven revised complete papers awarded including abstracts of 6 invited talks have been rigorously reviewed and chosen from 379 submissions. The papers tackle all present matters in theoretical computing device technology together with algorithms, automata, complexity, cryptography, database logics, software semantics, and programming theory.

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Extra resources for Automata, Languages and Programming: 31st International Colloquium, ICALP 2004, Turku, Finland, July 12-16, 2004. Proceedings

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G. [9,19,4]. html compiling known results on the complexity of approximation. The concept of automatizability was introduced by Bonet, Pitassi, Raz [14], and the remark that automatizability implies feasible interpolation is due to Impagliazzo (unpublished). Alekhnovich, Razborov [2] proved (modulo strong complexity assumptions) that Resolution (which does allow Feasible Interpolation) is not automatizable. Natural proofs were introduced by Razborov, Rudich [41], and [42] gave some unexpected applications in quite a different area.

To get we consider only the case when the number of factors is LZ-factorization is computed in time using suffix trees, time for integer alphabets, see [19,11])). There is possible a rather cosmetic improvement of the approximation ratio. Let be the size of the minimal grammar-based compression and assume we have a greedy LZ-factorization of a string of size into factors, the number is also a lower bound on The improvement is a direct application of a method from the paper on compressed matching of Farach and Thorup [10], (In their notation In [10] they improved a starting factor to by introducing new cut-points and refining factorization.

Razborov. Pseudorandom generators hard for resolution and polynomial calculus resolution. ru/˜razborov, 2002. A. Razborov. Resolution lower bounds for perfect matching principles. In Proceedings of the 17th IEEE Conference on Computational Complexity, pages 29–38, 2002. A. Razborov and S. Rudich. Natural proofs. Journal of Computer and System Sciences, 55(1):24–35, 1997. K. Regan, D. Sivakumar, and J. Cai. Pseudorandom generators, measure theory, and natural proofs. In Proceedings of the 36th IEEE Symposium on Foundations of Computer Science, pages 26–35, 1995.

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