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In algebra and number theory, a distribution is a function on a system of finite sets into an abelian group which is analogous to an integral: it is thus the algebraic analogue of a distribution in the sense of generalised function.

The original examples of distributions occur, unnamed, as functions φ on Q/Z satisfying

$\sum _{r=0}^{N-1}\varphi (x+\frac{r}{N})=\varphi (Nx).$

We shall call these ordinary distributions. They also occur in p-adic integration theory in Iwasawa theory.

Let ... → X_n+1 → X_n → ... be a projective system of finite sets with surjections, indexed by the natural numbers, and let X be their projective limit. We give each X_n the discrete topology, so that X is compact. Let φ = (φ_n) be a family of functions on X_n taking values in an abelian group V and compatible with the projective system:

$w(m,n)\sum _{y\mapsto x}\varphi (y)=\varphi (x)$

for some weight function w. The family φ is then a distribution on the projective system X.

A function f on X is "locally constant", or a "step function" if it factors through some X_n. We can define an integral of a step function against φ as

$\int fd\varphi =\sum _{x\in X_n}f(x){\varphi }_n(x).$

The definition extends to more general projective systems, such as those indexed by the positive integers ordered by divisibility. As an important special case consider the projective system Z/nZ indexed by positive integers ordered by divisibility. We identify this with the system (1/n)Z/Z with limit Q/Z.

For x in R we let ⟨x⟩ denote the fractional part of x normalised to 0 ≤ ⟨x⟩ < 1, and let {x} denote the fractional part normalised to 0 < {x} ≤ 1.

Examples

Hurwitz zeta function

The multiplication theorem for the Hurwitz zeta function

$\zeta (s,a)=\sum _{n=0}^{\mathrm{\infty }}(n+a{)}^{-s}$

gives a distribution relation

$\sum _{p=0}^{q-1}\zeta (s,a+p/q)=q^s\zeta (s,qa).$

Hence for given s, the map $t\mapsto \zeta (s,\{t\})$ is a distribution on Q/Z.

Bernoulli distribution

Recall that the Bernoulli polynomials B_n are defined by

$B_n(x)=\sum _{k=0}^n(\genfrac{}{}{0ex}{}{n}{n-k})b_k{x}^{n-k},$

for n ≥ 0, where b_k are the Bernoulli numbers, with generating function

$\frac{t{e}^{xt}}{e^t-1}=\sum _{n=0}^{\mathrm{\infty }}{B}_n(x)\frac{t^n}{n!}.$

They satisfy the distribution relation

$B_k(x)=n^{k-1}\sum _{a=0}^{n-1}{b}_k\left(\frac{x+a}{n}\right).$

Thus the map

${\varphi }_n:\frac{1}{n}\mathbb{\mathbb{Z}}/\mathbb{\mathbb{Z}}\to \mathbb{\mathbb{Q}}$

defined by

${\varphi }_n:x\mapsto n^{k-1}{B}_k(⟨x⟩)$

is a distribution.

Cyclotomic units

The cyclotomic units satisfy distribution relations. Let a be an element of Q/Z prime to p and let g_a denote exp(2πia)−1. Then for a≠ 0 we have

$\prod _{pb=a}{g}_b=g_a.$

Universal distribution

We consider the distributions on Z with values in some abelian group V and seek the "universal" or most general distribution possible.

Stickelberger distributions

Let h be an ordinary distribution on Q/Z taking values in a field F. Let G(N) denote the multiplicative group of Z/NZ, and for any function f on G(N) we extend f to a function on Z/NZ by taking f to be zero off G(N). Define an element of the group algebra F[G(N)] by

$g_N(r)=\frac{1}{|G(N)|}\sum _{a\in G(N)}h\left(⟨\frac{ra}{N}⟩\right){\sigma }_a^{-1}.$

The group algebras form a projective system with limit X. Then the functions g_N form a distribution on Q/Z with values in X, the Stickelberger distribution associated with h.

p-adic measures

Consider the special case when the value group V of a distribution φ on X takes values in a local field K, finite over Q_p, or more generally, in a finite-dimensional p-adic Banach space W over K, with valuation |·|. We call φ a measure if |φ| is bounded on compact open subsets of X. Let D be the ring of integers of K and L a lattice in W, that is, a free D-submodule of W with K⊗L = W. Up to scaling a measure may be taken to have values in L.

Hecke operators and measures

Let D be a fixed integer prime to p and consider Z_D, the limit of the system Z/pⁿD. Consider any eigenfunction of the Hecke operator T^{p with eigenvalue λ_p prime to p. We describe a procedure for deriving a measure of Z_D.}

Fix an integer N prime to p and to D. Let F be the D-module of all functions on rational numbers with denominator coprime to N. For any prime l not dividing N we define the Hecke operator T_l by

$(T_{l}f)\left(\frac{a}{b}\right)=f\left(\frac{la}{b}\right)+\sum _{k=0}^{l-1}f\left(\frac{a+kb}{lb}\right)-\sum _{k=0}^{l-1}f\left(\frac{k}{l}\right).$

Let f be an eigenfunction for T_p with eigenvalue λ_p in D. The quadratic equation X² − λ_pX + p = 0 has roots π₁, π₂ with π₁ a unit and π₂ divisible by p. Define a sequence a₀ = 2, a₁ = π₁+π₂ = λ_p and

$a_{k+2}={\lambda }_p{a}_{k+1}-p{a}_k,$

so that

$a_k={\pi }_1^k+{\pi }_2^k.$

References

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