Linked from
The 25 pages that link to Algebraic number field, each with the reason it gives.
Cyclotomic fieldNarrower topic: Every cyclotomic field is an algebraic number field.
Ring of integersNarrower topic: The ring of integers is defined separately for each such field.
Dedekind zeta functionNarrower topic: Each number field has its own Dedekind zeta function.
Algebraic integerNarrower topic: Algebraic integers in a number field form its ring of integers.
Hilbert class fieldNarrower topic: The Hilbert class field is defined relative to a number field.
Class number formulaNarrower topic: The formula applies to this field and its arithmetic invariants.
Albert–Brauer–Hasse–Noether theoremNarrower topic: The theorem's global field is a number field.
Birch–Tate conjectureNarrower topic: The conjecture is formulated separately for each number field.
Leopoldt's conjectureNarrower topic: The conjecture ranges over every such field.