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Abstract analytic number theory : ウィキペディア英語版
Abstract analytic number theory
Abstract analytic number theory is a branch of mathematics which takes the ideas and techniques of classical analytic number theory and applies them to a variety of different mathematical fields. The classical prime number theorem serves as a prototypical example, and the emphasis is on abstract asymptotic distribution results. The theory was invented and developed by mathematicians such as John Knopfmacher and Arne Beurling in the twentieth century.
== Arithmetic semigroups ==

The fundamental notion involved is that of an arithmetic semigroup, which is a commutative monoid ''G'' satisfying the following properties:
*There exists a countable subset (finite or countably infinite) ''P'' of ''G'', such that every element ''a'' ≠ 1 in ''G'' has a unique factorisation of the form
::a = p_1^ p_2^ \cdots p_r^
:where the ''p''''i'' are distinct elements of ''P'', the α''i'' are positive integers, ''r'' may depend on ''a'', and two factorisations are considered the same if they differ only by the order of the factors indicated. The elements of ''P'' are called the ''primes'' of ''G''.
*There exists a real-valued ''norm mapping'' |\mbox| on ''G'' such that
*#|1| = 1
*#|p| > 1 \mbox p \in P
*#|ab| = |a| |b| \mbox a,b \in G
*#The total number N_G(x) of elements a \in G of norm |a| \leq x is finite, for each real x > 0.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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