V
V[g]
gives the order or number of vertices of the graph 
.
Combinatorica`
Combinatorica`
V
As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. »
V[g]
gives the order or number of vertices of the graph 
.
Details and Options
- V functionality is now available in the built-in Wolfram Language function VertexCount.
- To use V, you first need to load the Combinatorica Package using Needs["Combinatorica`"].
Wolfram Research (2012), V, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/V.html.
Text
Wolfram Research (2012), V, Wolfram Language function, https://reference.wolfram.com/language/Combinatorica/ref/V.html.
CMS
Wolfram Language. 2012. "V." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/Combinatorica/ref/V.html.
APA
Wolfram Language. (2012). V. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/Combinatorica/ref/V.html