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Abstract
We shall use the Standard concepts and notations of set theory. We writex ∈S andy ∉S to indicate thatx is a member ofS, and thaty is not a member of |S| denotes the number of elements ofS, also called theorder ofS. If all elements ofS are also elements ofT, thenS is a subset ofT, written\( S \subseteq T \). The notationS ⊂T means thatS is a subset ofT but is not identical to T, so thatT has at least one element that is not inS.
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Department of Mathematics, Southern Illinois University, Carbondale, IL, 62901-4408, USA
W. D. Wallis
- W. D. Wallis
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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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