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A simple proof of the Erdős-Chao Ko-Rado theorem. (English) Zbl 0262.05002

MSC:
05A05 Permutations, words, matrices
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References:
[1] Erdös, P; Ko, Chao; Rado, R, Intersection theorem for system of finite sets, Quart. J. math. Oxford ser., 12, 313-318, (1961) · Zbl 0100.01902
[2] Lubell, D, A short proof of Sperner’s lemma, J. combinatorial theory, 1, 299, (1966) · Zbl 0151.01503
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