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The 2-twist-spun trefoil has the triple point number four |
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| Authors: | Shin Satoh Akiko Shima |
| Affiliation: | Department of Mathematics, Chiba University, Inage, Chiba, 263-8522, Japan ; Department of Mathematics, Tokai University, 1117 Kitakaname, Hiratuka, Kanagawa, 259-1292, Japan |
| Abstract: | The triple point number of an embedded surface in 4-space is the minimal number of the triple points on all the projection images into 3-space. We show that the 2-twist-spun trefoil has the triple point number four. |
| Keywords: | 2-knot surface-knot triple point cocycle invariant motion picture |
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