Home Online Manual
Top
Back: spmilnor
Forward: spgamma
FastBack:
FastForward:
Up: gmssing_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.6.13.20 spgeomgenus

Procedure from library gmssing.lib (see gmssing_lib).

Usage:
spgeomgenus(sp); list sp

Return:
int g; geometrical genus of spectrum sp

Example:
 
LIB "gmssing.lib";
ring R=0,(x,y),ds;
list sp=list(ideal(-1/2,-3/10,-1/10,0,1/10,3/10,1/2),intvec(1,2,2,1,2,2,1));
spprint(sp);
==> (-1/2,1),(-3/10,2),(-1/10,2),(0,1),(1/10,2),(3/10,2),(1/2,1)
spgeomgenus(sp);
==> 6