Hensel's Lemma - Statement

Statement

Let be a polynomial with integer (or p-adic integer) coefficients, and let m,k be positive integers such that mk. If r is an integer such that

and

then there exists an integer s such that

and

Furthermore, this s is unique modulo pk+m, and can be computed explicitly as

where

In this formula for t, the division by pk denotes ordinary integer division (where the remainder will be 0), while negation, multiplication, and multiplicative inversion are performed in .

As an aside, if, then 0, 1, or several s may exist (see Hensel Lifting below).

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