Cobordism invariants and characteristic classes

The concept of cobordism owes its origin to the Frenchman Henri Poincar e. The relation of cobordism is de ned for two closed manifolds M and N with same dimensión n. By de nition M And Nare cobordant if there is a manifold of di mension n+ 1 whose boundary is MtN; that is, the disjoint union of M a...