null graph
The null graph is the graph with no vertices or edges. The null graph is the initial object^{} in the category of graphs.
Further Reading

•
Harary, F. and Read, R. “Is the nullgraph a pointless concept?”, Lecture Notes in Mathematics 406 (1974), pp. 3744.
Title  null graph 

Canonical name  NullGraph 
Date of creation  20130322 12:48:42 
Last modified on  20130322 12:48:42 
Owner  mathcam (2727) 
Last modified by  mathcam (2727) 
Numerical id  11 
Author  mathcam (2727) 
Entry type  Definition 
Classification  msc 05C99 
Synonym  empty graph 