This research reveals minimal signature invariant values in torus links, indicating unique properties of topological cobordisms.
We construct efficient topological cobordisms between torus links and large connected sums of trefoil knots. As an application, we show that the signature invariant σ_ω at ω=ζ₆ takes essentially minimal values on torus links among all concordance homomorphisms with the same normalisation on the trefoil knot.
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Baader et al. (2025) studied this question.
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