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D.5.4.22 spgeomgenus
Procedure from library gaussman.lib (see gaussman_lib).
- Usage:
spgeomgenus(sp); list sp
- Return:
int g; geometrical genus of spectrum sp
Example:
LIB "gaussman.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 |