A set of nodes connected to one another by lines (edges) in which each connection has a specified direction such that no route that follows the direction of the connections enters a loop (cycle).
Notes
The
is a Directed Acyclic Graph.
are nodes and
are the directed lines that connect them. All
lead from a more specific
to a more general
, so a cycle would be a logical error (e.g. if "rubella virus" is a type of "virus"
and "virus" is a type of "microorganism", then "microorganism" cannot be a type of
"rubella virus").
