1. Network Notes Ms Allan 2012 AS91260 (2.5) Designed to teach from,
Not as complete notes.

2. ABC and D are Nodes or Vertices

3. BC is an arc, edge or path

4. There are two arc, edge or paths between A and B
There are two arc, edge or paths between A and B. Lets call them AB1 and AB2.

5. A has two arcs: it is an even Node.

6. B has 6 arcs, it is an even Node.

7. All Nodes are even => Traversable.

8. Node B has 7 arcs: it is an odd node
Node B has 7 arcs: it is an odd node. Node C has 5 arcs: it is an even node.

9. This network has Exactly 2 odd nodes: It is traversable starting at one odd node and ending at the other odd node.

10. More than 2 odd nodes? Not traversable!