Remark on a paper of J. Zaks
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Hansjoachim Walther
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Article
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1979
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Elsevier Science
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English
โ 312 KB
Let be YY, i = 0, 1,2, the family of all 3-valent 3-connected planar graphs having elementary k-gons only if k = i (mod 3). Improving a result of J. Zaks we can show the inequality