Abstract
We shall use the Standard concepts and notations of set theory. We write x ∈ S and y ∉ S to indicate that x is a member of S, and that y is not a member of |S| denotes the number of elements of S, also called the order of S. If all elements of S are also elements of T, then S is a subset of T, written \( S \subseteq T \). The notation S ⊂ T means that S is a subset of T but is not identical to T, so that T has at least one element that is not in S.
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© 2007 Second Edition, Birkhäuser Boston
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Wallis, W.D. (2007). Graphs. In: A Beginner’s Guide to Graph Theory. Birkhäuser Boston. https://doi.org/10.1007/978-0-8176-4580-9_1
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DOI: https://doi.org/10.1007/978-0-8176-4580-9_1
Publisher Name: Birkhäuser Boston
Print ISBN: 978-0-8176-4484-0
Online ISBN: 978-0-8176-4580-9
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