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Hamiltonian Lines in Infinite Graphs with Few Vertices of Small Valency C. ST. J. A. NASH-WILLIAMS (Waterloo, Ontario, Canada) 1. Introduction In this paper, 'iff' will mean 'if and only if'. A set will be called denumerable if its cardinal number is No, and countable if it is finite or denumerable. The set of positive integers will be denoted by P. The set-theoretic notation {al, a2 .... } will mean {ai:ieP}. A right-infinite sequence is an infinite sequence of the form al, a2, a3 .... and a left-infinite sequence is an infinite sequence of the form .... a_3, a_2, a_ 1. Right-infinite and left-infinite sequences will both be called one-way infinite. A two-way infinite sequence is an infinite sequence of the form .... a-2, a-a, ao, al, a2 ..... All graphs considered in this paper are understood to be without loops or multiple edges. The letter G will always denote a graph. The set of vertices of G will be called the vertex-set of G and denoted by V(G), and the set of edges of G will be called the edge-set of G and denoted by E(G). The valency (or degree) of a vertex ~ will be denoted by
aequationes mathematicae – Springer Journals
Published: May 18, 2005
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