Fixed elements of infinite trees
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Norbert Polat; Gert Sabidussi
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Article
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1994
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Elsevier Science
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English
β 380 KB
It is shown that any infinite tree not containing a ray has a fixed vertex or a fixed edge. The same also holds for trees with rays (not containing a subdivision of the dyadic tree) provided there are at least three ends of maximal order. I have found it a profitable exercise of the imagination, fr