Definition Using Interpolation
The Kubota–Leopoldt p-adic L-function Lp(s, χ) interpolates the Dirichlet L-function with the Euler factor at p removed. More precisely, Lp(s, χ) is the unique continuous function of the p-adic number s such that
for positive integers n divisible by p − 1. The right hand side is just the usual Dirichlet L-function, except that the Euler factor at p is removed, otherwise it would not be p-adically continuous. The continuity of the right hand side is closely related to the Kummer congruences.
When n is not divisible by p − 1 this does not usually hold; instead
for positive integers n. Here χ is twisted by a power of the Teichmuller character ω.
Read more about this topic: P-adic L-function
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