Boundary Dehn twists on punctured even-dimensional complete intersections and connected sums are commutators in the smooth mapping class group rel boundary, hence trivial after abelianization.
Homological instability for moduli spaces of smooth 4-manifolds, 2023
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Boundary Dehn twists are often commutators
Boundary Dehn twists on punctured even-dimensional complete intersections and connected sums are commutators in the smooth mapping class group rel boundary, hence trivial after abelianization.