Singular Manual: Coefficient rings

| ### 3.3.4 Coefficient rings SINGULAR supports coefficient ranges which are not fields, i.e. the integers 30#30 and the finite rings 65#65 for a number `n`. These coefficient rings were implemented in SINGULAR 3.0.5 and at the moment only limited functionality is available. ### p-adic numbers The p-adic integers 66#66 are the projective limit of the finite rings 67#67 for `n` to infinity. Therefore, computations in this ring can be approximated by computations in 67#67 for large `n`.

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