Is the root node an internal node?

Question

So I\'ve looked around the web and a couple of questions here in stackoverflow here are the definition:

• Generally, an internal node is any node that is not a leaf

Answer 1

IMHO when you are talking about a tree with more than one node we can say the root node is an internal node. When there is only one node (the root node) the question of internal node doesn't arise. Hence we can vacuously say it is an internal node.