mathlib documentation


Number fields #

This file defines a number field and the ring of integers corresponding to it.

Main definitions #

Implementation notes #

The definitions that involve a field of fractions choose a canonical field of fractions, but are independent of that choice.

References #

Tags #

number field, ring of integers

structure number_field (K : Type u_1) [field K] :

A number field is a field which has characteristic zero and is finite dimensional over ℚ.

theorem number_field.is_algebraic (K : Type u_1) [field K] [nf : number_field K] :
def number_field.ring_of_integers (K : Type u_1) [field K] :

The ring of integers (or number ring) corresponding to a number field is the integral closure of ℤ in the number field.


The ring of integers of K are equivalent to any integral closure of in K