Vertices of degree 6 in a contraction cr
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Kiyoshi Ando; Atsushi Kaneko; Ken-ichi Kawarabayashi
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Article
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2003
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Elsevier Science
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English
β 378 KB
An edge of a 6-connected graph is said to be 6-contractible if the contraction of the edge results in a 6-connected graph. A contraction critically 6-connected graph is a 6-connected graph with no 6-contractible edge. We prove that each contraction critically 6-connected graph G has at least 1 7 |V