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math.GT2024
Twist spun knots of twist spun knots of classical knots
Mizuki Fukuda, Masaharu Ishikawa
A -twist spun knot is an -dimensional knot in the -dimensional sphere which is obtained from an -dimensional knot in the -dimensional sphere by applying an ope…
math.GT2024
Combinatorial cusp count and clover invariants
Sebastian Baader, Masaharu Ishikawa
We construct efficient topological cobordisms between torus links and large connected sums of trefoil knots. As an application, we show that the signature invariant at $ω=ζ_6…