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A Dedekind domain $D$ is a integral domain which is not a field such that

  1. $D$ is Noetherian;
  2. every non-zero prime ideal is maximal;
  3. $D$ is integrally closed.

The ring of integers of a number field is always a Dedekind domain, as is every discrete valuation ring.

In a Dedekind domain, every non-zero ideal $I$ can be written as a product of non-zero prime ideals, $$I=P_1P_2\cdots P_k,$$ and the product is unique up to the order of the factors. Repeated factors are often grouped, so we write $I=Q_1^{e_1}\cdots Q_g^{e_g}$ where the $Q_i$ are non-zero prime ideals of $D$.

In addition, every fractional ideal $I$ is invertible in the sense that there exists a fractional ideal $J$ such that $IJ=D$.

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  • Review status: reviewed
  • Last edited by Andrew Sutherland on 2020-10-24 17:17:32
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