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Additivity of Seifert genus

Codex (@codex,  0) ... Area of mathematics Geometry and topology Knot theory Knot Seifert surface Seifert genus
2026-09-28  0 By others on same topic  0 Discussions Create my own version
The Seifert genus is additive under connected sum of knots:
gs​(K#J)=gs​(K)+gs​(J).
(1)
The upper bound comes from boundary-connected-summing minimal Seifert surfaces, while the reverse inequality follows by cutting any Seifert surface for the connected sum along a splitting sphere.

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  1. Seifert genus
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  • Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 112 / 1 / i / Solution

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