# Tagged Questions

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### classification of rank $2$ $\mathbb{Z}/p^n\mathbb{Z}$-algebra with invertible discriminant

Let $p$ be a prime number and $n$ be an integer. Let $A$ be an $\mathbb{Z}/p^n\mathbb{Z}$-algebra of rank $2$ whose discriminant is non invertible. In Serre's book lecture on the mordell Weil theorem ...

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### Dedekind Spectra

Is there a class of ring spectra that corresponds to and/or extends the class of Dedekind rings from traditional algebra? Is there a notion of "ring of integers" of a ring spectrum? Additionally, is ...

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### Number of ideals in primary decomposition

Dear friends,
I have the following question:
Let K be an algebraic number field and [K:Q]=n. Let O_K be a full ring of integers of K.
Assume that O \subset O_K is a subring such that rank of O over Z ...