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A contraction theorem for abstract graphs

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References

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  5. Dirac, G. A.: Trennende Knotenpunktmengen und Reduzibilität abstrakter Graphen mit Anwendung auf das Vierfarbenproblem. J. reine angew. Math.204, 116–131 (1960), Reduzierungssatz.

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  1. Hamburg

    G. A. Dirac

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  1. G. A. Dirac
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Dirac, G.A. A contraction theorem for abstract graphs. Math. Ann. 144, 93–96 (1961). https://doi.org/10.1007/BF01396547

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