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.
Mapping class groups of simply connected 4- manifolds with boundary.J
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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.