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**Reachability**— In graph theory, reachability is the notion of being able to get from one vertex in a directed graph to some other vertex. Definition For a directed graph D = ( V , A ), the reachability relation of D is its transitive closure, i.e. the set of… … Wikipedia**reachability**— n. state of being reachable; attainability … English contemporary dictionary**Maria (reachability analyzer)**— Maria: The Modular Reachability Analyzer is a reachability analyzer for concurrent systems that uses Algebraic System Nets (a high level variant of Petri nets) as its modelling formalism. External links http://www.tcs.hut.fi/Software/maria/… … Wikipedia**Subclass reachability**— In Exact concept learning, given a class of concepts C, a subclass D is reachable if there exists a partial approximation S of some concept such that D contains exactly those concepts in C that are extensions to S (i.e., D=C|S).ee alsoExclusion… … Wikipedia**OPTICS algorithm**— OPTICS ( Ordering Points To Identify the Clustering Structure ) is an algorithm for finding density based clusters in spatial data. It was presented by Mihael Ankerst, Markus M. Breunig, Hans Peter Kriegel and Jörg Sander[1]. Its basic idea is… … Wikipedia**Petri net**— A Petri net (also known as a place/transition net or P/T net) is one of several mathematical modeling languages for the description of distributed systems. A Petri net is a directed bipartite graph, in which the nodes represent transitions (i.e.… … Wikipedia**Directed acyclic graph**— An example of a directed acyclic graph In mathematics and computer science, a directed acyclic graph (DAG i … Wikipedia**SP-DEVS**— abbreviating Schedule Preserving Discrete Event System Specification is a formalism for modeling and analyzing discrete event systems in both simulation and verification ways. SP DEVS also provides modular and hierarchical modeling features which … Wikipedia**Border Gateway Protocol**— BGP redirects here. For the Formula One Team, see Brawn GP. The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or prefixes which designate network reachability … Wikipedia**Finite & Deterministic Discrete Event System Specification**— FD DEVS (Finite Deterministic Discrete Event System Specification) is a formalism for modeling and analyzing discrete event dynamic systems in both simulation and verification ways. FD DEVS also provides modular and hierarchical modeling features … Wikipedia