New sufficient conditions make every Whitehead torsion realizable by inertial smooth h-cobordisms in dimension 4, and Cohen's dim invariant is shown to obstruct the standard construction.
Lawson,Decomposing 5-manifolds and doubles, Houston J
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Some remarks on $h$-cobordisms between smooth 4-manifolds
New sufficient conditions make every Whitehead torsion realizable by inertial smooth h-cobordisms in dimension 4, and Cohen's dim invariant is shown to obstruct the standard construction.