from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
unionof a finite sequence of surfacestaken over a diskcommon to every adjacent pair of the sequence, such that the boundaryof the disk comprises some even number of closed arcs, disjoint except at their endpoints, which are alternatingly subarcsof the two surfaces' boundaries.
- noun The union of
linksformed by taking such a sum of their Seifert surfacesand taking the boundary of the result.
from Wiktionary, Creative Commons Attribution/Share-Alike License
After Kunio Murasugi.
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