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copy text from [http://www.opencycle.net/ OpenCycle] of which Jon Awbrey is the sole author
The '''null graph''' or the '''empty graph''' is the [[graph (mathematics)|graph]] with no points and no lines.
==Reference==
* [[Frank Harary|Harary, F.]] and Read, R., "Is the Null Graph a Pointless Concept?", ''Graphs and Combinatorics Conference'', George Washington University, Springer-Verlag, New York, NY, 1973.
[[Category:Combinatorics]]
[[Category:Graph Theory]]
[[Category:Mathematics]]
[[Category:Relation Theory]]
[[Category:Set Theory]]
[[Category:Topology]]
==Reference==
* [[Frank Harary|Harary, F.]] and Read, R., "Is the Null Graph a Pointless Concept?", ''Graphs and Combinatorics Conference'', George Washington University, Springer-Verlag, New York, NY, 1973.
[[Category:Combinatorics]]
[[Category:Graph Theory]]
[[Category:Mathematics]]
[[Category:Relation Theory]]
[[Category:Set Theory]]
[[Category:Topology]]