On the strongly regular graphs obtained from quasi-symmetric 2-(31,7,7) designs

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概要

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• It is known that the five non-isomorphic quasi-symmetric 2-(31, 7, 7) designs lead to non-isomorphic strongly regular graphs with parameters (155, 42, 17, 9). We will show that there exist no isomorphisms among these graphs and the block graphs of the Steiner triple systems STS(31) except the isomorphism between the block graphs of the point-plane design and the point-line design of PG(4, 2).

• 山形大学の論文
• 2005-02-15

著者

• Wakabayashi Takehisa

  Graduate School Of Science And Engineering Yamagata University

• HORIGUCHI Naoyuki

  Graduate School of Science and Technology, Chiba University

• NAKASORA Hiroyuki

  Graduate School of Natural Science and Technology, Okayama University

• Horiguchi Naoyuki

  Graduate School Of Science And Technology Chiba University

• Nakasora Hiroyuki

  Graduate School Of Natural Science And Technology Okayama University

関連論文

• On the strongly regular graphs obtained from quasi-symmetric 2-(31,7,7) designs

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