An example of a graph and its prism is shown below.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
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From a graph G = (V, E), with vertices v; E V and edges e; € E, the prism of the graph,
P(G) = (Vp, Ep), is formed as follows:
Let V' be a copy of V with vertices vị, and E' a copy of E with edges e. Now
V, = VUV', and
E, = EU E'U {(vi, v?)|v; E V }.
An example of a graph and its prism is shown below.
(a) If a graph G has n vertices and k edges, find formulae for the number of vertices
and the number of edges in P(G) in terms of n and k.
(b) Explain why none of the following can be the prism of any connected graph:
i. A graph with 9 vertices.
ii. A graph with 10 vertices and 10 edges.
iii. A simple graph with 3 edges.
Transcribed Image Text:From a graph G = (V, E), with vertices v; E V and edges e; € E, the prism of the graph, P(G) = (Vp, Ep), is formed as follows: Let V' be a copy of V with vertices vị, and E' a copy of E with edges e. Now V, = VUV', and E, = EU E'U {(vi, v?)|v; E V }. An example of a graph and its prism is shown below. (a) If a graph G has n vertices and k edges, find formulae for the number of vertices and the number of edges in P(G) in terms of n and k. (b) Explain why none of the following can be the prism of any connected graph: i. A graph with 9 vertices. ii. A graph with 10 vertices and 10 edges. iii. A simple graph with 3 edges.
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