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» Quotient Complexity of Regular Languages
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SODA
2001
ACM
92views Algorithms» more  SODA 2001»
13 years 10 months ago
On universally easy classes for NP-complete problems
We explore the natural question of whether all NP-complete problems have a common restriction under which they are polynomially solvable. More precisely, we study what languages a...
Erik D. Demaine, Alejandro López-Ortiz, J. ...
CORR
2011
Springer
170views Education» more  CORR 2011»
13 years 4 months ago
On the Decidability of Connectedness Constraints in 2D and 3D Euclidean Spaces
We investigate (quantifier-free) spatial constraint languages with equality, contact and connectedness predicates, as well as Boolean operations on regions, interpreted over low-...
Roman Kontchakov, Yavor Nenov, Ian Pratt-Hartmann,...
TOG
2008
143views more  TOG 2008»
13 years 9 months ago
Discovering structural regularity in 3D geometry
We introduce a computational framework for discovering regular or repeated geometric structures in 3D shapes. We describe and classify possible regular structures and present an e...
Mark Pauly, Niloy J. Mitra, Johannes Wallner, Helm...
DBPL
2001
Springer
115views Database» more  DBPL 2001»
14 years 1 months ago
Optimization Properties for Classes of Conjunctive Regular Path Queries
Abstract. We are interested in the theoretical foundations of the optimization of conjunctive regular path queries (CRPQs). The basic problem here is deciding query containment bot...
Alin Deutsch, Val Tannen
AAAI
2007
13 years 11 months ago
Answering Regular Path Queries in Expressive Description Logics: An Automata-Theoretic Approach
Expressive Description Logics (DLs) have been advocated as formalisms for modeling the domain of interest in various application areas. An important requirement is the ability to ...
Diego Calvanese, Thomas Eiter, Magdalena Ortiz