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MST
2010
79views more  MST 2010»
13 years 5 months ago
A Search Algorithm for Subshift Attractors of Cellular Automata
Abstract. We describe a heuristic algorithm which searches for spreading clopen sets of a cellular automaton. Then the algorithms searches for the corresponding subshift attractors...
Enrico Formenti, Petr Kurka, Ondrej Zahradní...
MST
2010
81views more  MST 2010»
13 years 5 months ago
Quantum Search with Variable Times
Since Grover’s seminal work, quantum search has been studied in great detail. In the usual search problem, we have a collection of n items x1, . . . , xn and we would like
Andris Ambainis
MST
2010
105views more  MST 2010»
13 years 5 months ago
On the Automatizability of Polynomial Calculus
Abstract We prove that Polynomial Calculus and Polynomial Calculus with Resolution are not automatizable, unless W[P]-hard problems are fixed parameter tractable by one-side error...
Nicola Galesi, Massimo Lauria
MST
2007
104views more  MST 2007»
13 years 7 months ago
Randomized Algorithms for 3-SAT
In [Sch99], Sch¨oning proposed a simple yet efficient randomized algorithm for solving the k-SAT problem. In the case of 3-SAT, the algorithm has an expected running time of poly...
Thomas Hofmeister, Uwe Schöning, Rainer Schul...
MST
2007
90views more  MST 2007»
13 years 7 months ago
Optimal Semicomputable Approximations to Reachable and Invariant Sets
In this paper we consider the computation of reachable, viable and invariant sets for discrete-time systems. We use the framework of type-two effectivity, in which computations a...
Pieter Collins