Odd and Even Vertices

Date: 1/30/96 at 12:11:34
From: "Rebecca J. White"
Subject: Networks

Dear Dr. Math,

We have a question.  We are tracing networks and trying to trace 
them without crossing a line or picking up our pencils. We don't 
understand about what odd or even vertices are.  How can we know if a 
vertex is odd or even?  

               Sincerely,

               Taylor, Tristan, 
               And The rest of Mrs.Stanko's 3/4 class 

                    c/o Rebecca White, Library Information Specialist
                    Shaffer Elementary School, Little, Colorado

Date: 7/29/96 at 13:22:3
From: Doctor Jerry
Subject: Re: Networks

Hello.

A vertex is odd if an odd number of arcs is attached to the vertex; 
it is even if an even number of arcs is attached to the vertex.

-Doctor Jerry,  The Math Forum
 Check out our web site!  http://mathforum.org/dr.math/