Top
Back: isEqualDivisor
Forward: degreeDivisor
FastBack:
FastForward:
Up: divisors_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.15.5.7 globalSections

Procedure from library divisors.lib (see divisors_lib).

Usage:
globalSections(A); A = divisor.

Assume:
A is a divisor on X.

Return:
a list with a basis of the space of global sections of D.

Theory:
We assume that the qring of X satisfies the S2-condition and that X is smooth. We compute sat((f*J) : I) /f where D = (I)-(J).

Example:
 
LIB "divisors.lib";
ring r=31991,(x,y,z),dp;
ideal I = y^2*z - x*(x-z)*(x+3*z);
qring Q = std(I);
divisor P = makeDivisor(ideal(x,z),ideal(1));
divisor D = multdivisor(4,P);
globalSections(D);


Top Back: isEqualDivisor Forward: degreeDivisor FastBack: FastForward: Up: divisors_lib Top: Singular Manual Contents: Table of Contents Index: Index About: About this document
            User manual for Singular version 4-0-3, 2016, generated by texi2html.