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Equivalence problem for star-free regular expressions with squaring. [21] Covering for linear grammars [37] Structural equivalence for linear grammars [38] Equivalence problem for Regular grammars [39] Emptiness problem for ET0L grammars [40] Word problem for ET0L grammars [41] Tree transducer language membership problem for top down finite ...
Area code 419 was assigned to the northwest quadrant of the state. The overlay area code 567 was created on January 1, 2002. Despite the presence of Toledo, the state's fourth-largest city, 419 had been the last of Ohio's original four numbering plan areas, and one of the few original NPAs not covering an entire state, that had never been split ...
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This tool has been used for the linear search problem, i.e., finding a target on the infinite line, which has attracted much attention over several decades and has been analyzed as a search game. [5] It has also been used to find a minimax trajectory for searching a set of concurrent rays.
The linear search problem was solved by Anatole Beck and Donald J. Newman (1970) as a two-person zero-sum game. Their minimax trajectory is to double the distance on each step and the optimal strategy is a mixture of trajectories that increase the distance by some fixed constant. [ 8 ]
Brauer's Problem 12 of the same list asks whether the character table of a finite group determines if its Sylow -subgroups are abelian. Solving Brauer's height zero conjecture for blocks whose defect groups are Sylow p {\displaystyle p} -subgroups (or equivalently, that contain a character of degree coprime to p {\displaystyle p} ) also gives a ...
is the free-air gravity anomaly. δ g B {\displaystyle \delta g_{B}} is the Bouguer correction which allows for the gravitational attraction of rocks between the measurement point and sea level; δ g T {\displaystyle \delta g_{T}} is a terrain correction which allows for deviations of the surface from an infinite horizontal plane
The Bernstein problem was originally posed by Eugenio Calabi in 1970, who proved some special cases of the result. Simple examples show that there are a number of hypersurfaces of Minkowski space of zero mean curvature which fail to be spacelike.