Abstract

This chapter describes the dimension of formal fibers of a local ring. If (A, m) is a noetherian local ring and A is its m-adic completion. The fibers of the morphism Spec(Â) → Spec(A) are the formal fibers of A. As  has very good properties and as  is flat over A, A has a good property if the formal fibers have related good properties. This is the philosophy of Grothendieck's theory of excellent rings. The fiber over the generic point (0) of Spec(A) is called the generic fiber.

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