Titlebook: Automata, Languages and Programming; 31st International C Josep Díaz,Juhani Karhumäki,Donald Sannella Conference proceedings 2004 Springer-

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Grammar Compression, LZ-Encodings, and String Algorithms with Implicit Inputthe relation between two implicit representations, the role of word compression in solvability of word equations and compressed language recognition problems. The grammar compression is more convenient than .-encoding, its size differs from that of .-encoding by at most logarithmic factor, the const

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Deciding Knowledge in Security Protocols Under Equational Theoriesnowledge is often treated in terms of message deducibility and indistinguishability relations. In this paper we study the decidability of these two relations. The messages in question may employ functions (encryption, decryption, etc.) axiomatized in an equational theory. Our main positive results s

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Exponential Lower Bounds for the Running Time of DPLL Algorithms on Satisfiable Formulasons. The recursion trees of DPLL algorithm executions on unsatisfiable formulas are equivalent to tree-like resolution proofs. Therefore, lower bounds for tree-like resolution (known since 1960s) apply to them. However, these lower bounds say nothing about their behavior on . formulas. Proving expon

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Learning a Hidden Subgraphy whether a set of vertices induces an edge. Questions of this type are motivated by problems in molecular biology. In the deterministic nonadaptive setting, we prove nearly matching upper and lower bounds for the minimum possible number of queries required when the family is the family of all stars

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