An alternative enumeration of self-complementary graphs
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Nakamoto, Atsuhiro
[1
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Shirakura, Teruhiro
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Kobe Univ, Dept Math & Informat, Fac Human Dev, Kobe, Hyogo 6578501, JapanYokohama Natl Univ, Dept Math, Fac Educ & Human Sci, Yokohama, Kanagawa 2408502, Japan
Shirakura, Teruhiro
[2
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Tazawa, Shinsei
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Kinki Univ, Dept Math, Fac Sci & Engn, Higashiosaka, Osaka 5778502, JapanYokohama Natl Univ, Dept Math, Fac Educ & Human Sci, Yokohama, Kanagawa 2408502, Japan
Tazawa, Shinsei
[3
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[1] Yokohama Natl Univ, Dept Math, Fac Educ & Human Sci, Yokohama, Kanagawa 2408502, Japan
[2] Kobe Univ, Dept Math & Informat, Fac Human Dev, Kobe, Hyogo 6578501, Japan
[3] Kinki Univ, Dept Math, Fac Sci & Engn, Higashiosaka, Osaka 5778502, Japan
Let e(n), o(n), sc(n) be the number of unlabelled graphs of order n with an even number of edges, the number of those with an odd number of edges, and the number of unlabelled self-complementary graphs of order, n, respectively. In 2001, Gordon F. Royle conjectured the equality sc(n) = e(n) - o(n). This paper shows that this conjecture is true.