Morse theory | Commutative algebra | Ring theory

Novikov ring

In mathematics, given an additive subgroup , the Novikov ring of is the subring of consisting of formal sums such that and . The notion was introduced by Sergei Novikov in the papers that initiated the generalization of Morse theory using a closed one-form instead of a function. The notion is used in quantum cohomology, among the others. The Novikov ring is a principal ideal domain. Let S be the subset of consisting of those with leading term 1. Since the elements of S are unit elements of , the localization of with respect to S is a subring of called the "rational part" of ; it is also a principal ideal domain. (Wikipedia).

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Related pages

Quantum cohomology | Homology (mathematics) | Morse theory | Connected space | Chain complex | Principal ideal domain | Localization (commutative algebra) | Morse homology | Smoothness | Structure theorem for finitely generated modules over a principal ideal domain | Morse inequalities | Differentiable manifold