divisor theory in finite extension
Theorem. Let the integral domain , with the quotient field , have the divisor theory , determined (see divisors and exponents) by the exponent (http://planetmath.org/ExponentValuation2) system of . If is a finite extension
, then the exponent system , consisting of the continuations (http://planetmath.org/ContinuationOfExponent) of all exponents in to the field , determines the divisor theory of the integral closure
of in .
Corollary. In the ring of integers of any algebraic number field , there is a divisor theory , determined by the set of all exponent valuations of .
References
- 1 S. Borewicz & I. Safarevic: Zahlentheorie. Birkhäuser Verlag. Basel und Stuttgart (1966).