
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Please do the following questions with handwritten working out

Transcribed Image Text:Q 3 The graph in figure 1 is a sales network, where
• s represents a factory producing pop-its,
⚫t is the local school,
-
• other vertices (a – f) are agents onselling
pop-its.
edges represent sales connections
S
t
A radical group wants to stop pop-its reaching
the local school by disrupting sales.
f
Figure 1: Graph to disconnect
(a) What is the minimum number of connections whose deletion would stop pop-its reaching
the local school?
(b) A marketing expert claims that network is 3-edge connected between s and t, explain why
they are mistaken.
(c) We can translate the network into a network by attaching directions to each edge.
(i) If we ignore that we want s to be the source and t to be the sink, then how many
orientations can we put on the graph?
(ii) We do wants to be the source and t to be the sink of a network. How many networks
can we setup?
(iii) For the network in figure 2 (with the given
intial flow), use Ford-Fulkerson to show it
is a maximum flow, identify the min-cut,
and explain why this result implies the
original graph is at least 2-edge connected
from s to t.
1,1
a
d
1,1
1,0
1,0 1,1
1,1
1,1
S
b
t
1,1 1,0
1,0
с
f
1,1
Figure 2: Graph with flow
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