Definitions for

**"directed"**Attribute of an edge and a graph. An edge is called directed if it has a distinct source node and a distinct target node, i.e., if it has direction. A graph is called directed if all edges from the edge set are directed. Attribute of a tree. A tree is called directed if all its edges are uniformly pointing towards the leaf nodes. See Also Graph, Edge, Tree.

graphs or digraphs are the graphic representations of directional relation al data among entities in a set. Entities are illustrated as nodes, and the directional relations, if they exist, are illustrated as arcs, with the arrowhead pointing from the source or sending node to the destination or receiving node. Formally, a digraph is a finite, non-empty set , whose elements g} are called nodes, together with a set = { 12, 13,... 1g,... g-1,g} of ordered pairs ij, called arcs, where i and j are distinct members of ( Robinson and Foulds, 1980).

non-empty subset of a poset is called directed, if, for all elements and of , there is an element of such that â‰¤ and â‰¤ . The dual notion is called filtered.

having a specified direction; often used in combination; as, goal-directed.

(often used in combination) having a specified direction; "a positively directed vector"; "goal-directed"

manageable by a supervising agent; "a directed program of study"