The 2-twist-spun trefoil has the triple point number four

Satoh, Shin; Shima, Akiko

doi:10.1090/S0002-9947-03-03181-7

The 2-twist-spun trefoil has the triple point number four
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by Shin Satoh and Akiko Shima PDF

Trans. Amer. Math. Soc. 356 (2004), 1007-1024 Request permission

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.

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