"I have disengaged the life support wheel's internal nodes from the network."

Sometimes an additional assumption is made that these internal nodes do represent ancestors.

An octree is a tree data structure in which each internal node has exactly eight children.

A quadtree is a tree data structure in which each internal node has exactly four children.

It is well known that any rooted tree with k leaves has at most k-1 internal nodes.

Further, aquifer flow conditions can be given for the internal nodes.

The result is that every internal node has at least two children.

At every internal node, a set of variables is maintained.

A B+ tree consists of a root, internal nodes and leaves.

They are always internal nodes (above the bottom) of the parse tree.