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A

*graph *consists of a set of objects called

**Description**
*vertices *and a list of pairs of vertices, called

*edges*.

tures, with vertex

*A *represented by a dot
The edge joining

*A *to

*A *is called a

*loop*,
labelled

*A *and each edge

*AB *represented
and the graph is called a

*loop multigraph*.

by a curve joining

*A *and

*B*.

A

*general *graph is one with possible loops
data or relationships, and they make it easyto recognise properties which might other-wise not be noticed.

**Problems represented by**
edges is useful when graphs have to be ma-
Many problems require vertices to be con-
nipulated by computer. It is also a useful
nected by a “path” of successive edges. We
starting point for precise definitions of graph
shall define paths (and related concepts)
next lecture, but the following examples il-lustrate the idea and show how often it

**Examples of graphs**
**Description**
graph pictures when searching for paths.

**1. Gray codes**
The binary strings of length

*n *are taken as
the vertices, with an edge joining any two
tween each pair of vertices, and no vertex
vertices that differ in only one digit. This
joined to itself, is called a

*simple graph.*
**Description**
Vertices:

*A*,

*B*,

*C*,

*D*Edges:

*AB*,

*AB*,

*BC*,

*BC*,
and the 3-digit binary strings form an ordi-
more than one edge, is called a

*multigraph*.

the 6-litre jug, and then pour from one jugto another, always stopping when the jugbeing poured to becomes full or when the
jug being poured from becomes empty.

Is it possible to reach a state where one
A Gray code of length

*n *is a path which
jug contains 1 litre and another contains 5
includes each vertex of the

*n*-cube exactly
000

*, *001

*, *011

*, *010

*, *110

*, *111

*, *101

*, *100

*a *= number of litres in the 3-litre jug

*b *= number of litres in the 4-litre jug

*c *= number of litres in the 6-litre jug
(

*a , b , c *) can be reached from (

*a, b, c*) bypouring as described above, we put a

*di-*
If (

*a, b, c*) can also be reached from
(

*a , b , c *), we join them by an ordinary edge.

**Remark. **The

*n*-cube has been popular

as a

*computer architecture *in recent years.

reached from (0

*, *0

*, *6), we find the following
Processors are placed at the vertices of an

*n*-cube (for

*n *= 15 or so) and connectedalong its edges.

**2. Travelling salesman problem**
Vertices are towns. Two towns are joined byan edge labelled

*l *if there is a road of length
edges, is called a

*directed graph *or

*digraph*.

length which includes all towns, in this case
(0

*, *0

*, *6)

*→ *(0

*, *4

*, *2)

*→ *(3

*, *1

*, *2)

*→ *(0

*, *1

*, *5)

**3. Jug problems**
hence we can start with a full 6-litre jug and
Suppose we have three jugs, which hold ex-
in three pourings get 1 litre in the 4-litre jug
actly 3, 4 and 6 litres respectively. We fill

Source: http://m91199119.fastmail.fm/mat1830/lecturesetc/lect26.pdf

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