transfinite arithmetic, cardinal arithmetic, ordinal arithmetic
prime field, p-adic integer, p-adic rational number, p-adic complex number
arithmetic geometry, function field analogy
The original Euler product is an expression of the Riemann zeta function as an infinite product (instead of an infinite sum as originally defined) over all prime numbers. More generally one considers Euler product expressions for general zeta functions and L-functions (various types of L-functions are defined by an Euler product, such as the Artin L-function).
When the Riemann zeta function is understood as an adelic integral via Iwasawa-Tate theory, then the existence of Euler product expressions follows from the fact that the integration measure on the idele group $\mathbb{I}_{\mathbb{Q}}$ used in this context is a product of measures on all p-adic number-components:
if a function $f\colon \mathbb{I} \longrightarrow \mathbb{R}$ has product form $f = \underset{v}{\prod} f_v$ then
(reviewed e.g. in Garrett 11, 1.6)
Discussion from the point of view of adelic integration in Iwasawa-Tate theory is for instance in
(pdf)
Last revised on December 10, 2014 at 15:21:39. See the history of this page for a list of all contributions to it.