A multiple group rack and oriented spatial surfaces
arXiv:1912.03069 · doi:10.1142/s0218216520500467
Abstract
A spatial surface is a compact surface embedded in the 3-sphere. In this paper, we provide several typical examples of spatial surfaces and construct a coloring invariant to distinguish them. The coloring is defined by using a multiple group rack, which is a rack version of a multiple conjugation quandle.
17 pages, 19 figures