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Contents
1 General classification of p-adic representations
2 Period rings and comparison isomorphisms in arithmetic geometry

General classification of p-adic representations
Let K be a local field with residue field k of characteristic p. In this article, a p-adic representation of K (or of GK, the absolute Galois group of K) will be a continuous representation ρ : GK→ GL(V), where V is a finite-dimensional vector space over Qp.
The collection of all p-adic representations of K form an abelian category denoted \mathrm {Rep} _{\mathbf {Q} _{p}}(K)}{\mathrm {Rep}}_{{{\mathbf {Q}}_{p}}}(K) in this article.
p-adic Hodge theory provides subcollections of p-adic representations based on how nice they are, and also provides faithful functors to categories of linear algebraic objects that are easier to study. The basic classification is as follows:[2]

{Rep} _{\mathrm {cris} }(K)\subsetneq {Rep} _{st}(K)\subsetneq {Rep} _{dR}(K)\subsetneq {Rep} _{HT}(K)\subsetneq {Rep} _{\mathbf {Q} _{p}}(K)}
where each collection is a full subcategory properly contained in the next. In order, these are the categories of crystalline representations, semistable representations, de Rham representations, Hodge?Tate representations, and all p-adic representations.
In addition, two other categories of representations can be introduced, the potentially crystalline representations Reppcris(K) and the potentially semistable representations Reppst(K).
The latter strictly contains the former which in turn generally strictly contains Repcris(K); additionally, Reppst(K) generally strictly contains Repst(K), and is contained in RepdR(K) (with equality when the residue field of K is finite, a statement called the p-adic monodromy theorem).

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