Sebastian Baader

activity

20182026

most citedMultiple addition, deletion and restriction theorems for hyperplane arrangements

2 citations · 2 across the 2 of their papers we have counts for

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math.GT2026

Étude on the Delta-unknotting number

Sebastian Baader, Lukas Lewark

We derive an almost sharp lower bound on the Casson invariant of positive braid knots. As a consequence, we show that the $Δ$ -unknotting number is quasi-additive on the set of posi…

math.GT2019

Untwisting 3-strand torus knots

Sebastian Baader, Ian Banfield, Lukas Lewark

We prove that the signature bound for the topological 4-genus of 3-strand torus knots is sharp, using McCoy's twisting method. We also show that the bound is off by at most 1 for 4…