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Homomorphism theorems for graphs. (English) Zbl 0115.41005

MSC:
05Cxx Graph theory
Keywords:
graph theory
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References:
[1] Dirac, G. A.: A contraction theorem for abstract graphs. Math. Ann.144, 93 (1961). · Zbl 0107.17301
[2] ?? In abstrakten Graphen vorhandene vollständige 4-Graphen und ihre Unterteilungen. Math. Nachr.22, 61, Satz 6 (1960). · Zbl 0096.17903
[3] Wagner, K.: Bemerkungen zu Hadwigers Vermutung. Math. Ann.141, 433 (1960). · Zbl 0096.17904
[4] ?? Über eine Eigenschaft der ebenen Komplexe. Math. Ann.114, 570 (1937). · Zbl 0017.19005
[5] ?? Über eine Erweiterung eines Satzes vonKuratowski. Deutsche Math.2, 280 (1937). · JFM 63.0549.02
[6] Halin, R.: Über einen graphentheoretischen Basisbegriff und seine Anwendung auf Färbungsprobleme. Inaugural-Dissertation, Köln 1962.
[7] Loc. cit. 2, Satz 5.
[8] Dirac, G. A.: Some theorems on abstract graphs. Proc. London Math. Soc. (3)2, 69 (1952), Theorem 3. · Zbl 0047.17001
[9] Wagner, K.: Zwei Bemerkungen über Komplexe. Math. Ann.112, 317 (1936). · JFM 62.0655.03
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