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Homomorphisms of graphs and of their orientations. (English) Zbl 0375.05023


MSC:

05C10 Planar graphs; geometric and topological aspects of graph theory
05C99 Graph theory
05C20 Directed graphs (digraphs), tournaments
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References:

[1] Hedrlín, Z., andA. Pultr: On the representation of small categories. Dokl. Akad. Nauk SSSR160, 284–286 (1965).
[2] Hell, P., andJ. Nešetřil: Graphs andk-societies. Canad. Math. Bull.13, 375–381 (1970). · Zbl 0209.32201
[3] Hell, P.: Full embeddings into some categories of graphs. Alg. Univ.2, 129–141 (1972). · Zbl 0257.05115
[4] Hell, P.: On some strongly rigid families of graphs and the full embeddings they induce. Alg. Univ.4, 108–126 (1974). · Zbl 0299.05109
[5] Hell, P.: On some independence results in graph theory. Proceedings of the Conference on Algebraic Aspects of Combinatorics (D. Corneil and E. Mendelsohn eds.). University of Toronto, Utilitas Math. 1975, pp. 89–122. · Zbl 0315.05113
[6] Mitchell, B.: Theory of Categories. New York-London: Academic Press. 1965. · Zbl 0136.00604
[7] Nešetřil, J.: On symmetric and antisymmetric relations. Mh. Math.76, 323–327 (1972). · Zbl 0248.05119
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