Weil divisors on schemes
Let be a noetherian integral separated scheme such that every local ring of of dimension one is regular (such a scheme is said to be regular in codimension one, or non-singular in codimension one).
Definition.
A prime divisor on is a closed integral subscheme of codimension one. We define an abelian group generated by the prime divisors on . A Weil divisor is an element of . Thus, a Weil divisor can be written as:
where the sum is over all the prime divisors of , the are integers and only finitely many of them are non-zero. A degree of a divisor is defined to be . Finally, a divisor is said to be effective if for all the prime divisors .
For more information, see Hartshorne’s book listed in the bibliography for algebraic geometry.
Title | Weil divisors on schemes |
---|---|
Canonical name | WeilDivisorsOnSchemes |
Date of creation | 2013-03-22 15:34:08 |
Last modified on | 2013-03-22 15:34:08 |
Owner | alozano (2414) |
Last modified by | alozano (2414) |
Numerical id | 4 |
Author | alozano (2414) |
Entry type | Definition |
Classification | msc 14C20 |
Related topic | BibliographyForAlgebraicGeometry |
Defines | prime divisor |
Defines | effective divisor |
Defines | regular in codimension one |