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c# barcode generator open source DATA REDUNDANCY AND DATABASE DESIGN: FURTHER THOUGHTS NUMBER ONE in Font
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A tree T consists of a finite set N of nodes and a finite set E of edges (also known as arcs). T is empty if N is empty (in which case E is necessarily empty too), otherwise it is nonempty. Each edge in E connects exactly two distinct nodes in N and represents a directed path from one of those two nodes to the other; the from node is a parent node and the to node is a child node. Each parent node is connected by edges to one or more child nodes. Each child node is connected by an edge to exactly one parent node. A node connected to no child nodes is a leaf node. A node connected to no parent node is a root node. If T is nonempty, it has exactly one root node, otherwise it has no root node at all. For example, in the nonempty tree shown in Figure 141, we have: Nine nodes and eight edges (a nonempty tree always has one more node than it has edges) Four parent nodes A, B, D, and G Eight child nodes every node except A (a nonempty tree always has exactly one node, the root, that isn t a child) One root node A Five leaf nodes C, F, E, H, I The nodes themselves can be anything at all: integers, character strings, records, etc. (even trees!). $ % * & ' ( + , )

