Singular fibers and 4-dimensional cobordism group
Singular fibers and 4-dimensional cobordism group
Using the technique of singular fibers of C ∞ stable maps, we give a new proof to the theorem, originally due to Rohlin, that the oriented cobordism group of 4-dimensional manifolds is infinite cyclic and is generated by the cobordism class of the complex projective plane.A byproduct is a new …