Question

Prove that if $G$ is a graph, then every component of $G$ is a graph.

   Prove that if $G$ is a graph, then every component of $G$ is a graph.
Introduction to Topology: Pure and Applied
Introduction to Topology: Pure and Applied
Colin Adams, Robert… 1st Edition
Chapter 13, Problem 4 ↓

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A graph \( G \) consists of a set of vertices \( V \) and a set of edges \( E \) that connect pairs of vertices.  Show more…

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Prove that if $G$ is a graph, then every component of $G$ is a graph.
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Key Concepts

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Graph
A graph is a mathematical structure consisting of a set of vertices and a set of edges, where edges connect pairs of vertices. This concept is fundamental in discrete mathematics and computer science, and it serves as the framework for modeling relationships between objects.
Subgraph
A subgraph is formed by selecting a subset of the vertices and a subset of the edges of a larger graph. It retains the properties and structure of the original graph, making it a useful tool for isolating and studying parts of a graph.
Component
A component, often referred to as a connected component, is a maximal connected subgraph. It contains vertices and edges such that every pair of vertices in the component is connected by a path. Components are essential for understanding the structure of a graph because they partition the graph into pieces that are internally connected but disconnected from each other.

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Prove that every graph G = (V, E) is a disjoint union of its connected components, i.e., there are subgraphs G1, G2, ..., Gk with disjoint sets of vertices V1, V2, ..., Vk such that each Gi is a connected component of G and U(i=1 to k) Vi = V. (hint: induction)

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