Home Online Manual
Top
Back: normalBundle
Forward: linesHypersurface
FastBack:
FastForward:
Up: schubert_lib
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

D.5.15.29 multipleCover

Procedure from library schubert.lib (see schubert_lib).

Usage:
multipleCover(d); d int

Return:
number

Theory:
This is the contribution of degree d multiple covers of a smooth rational curve as a Gromov-Witten invariant.

Example:
 
LIB "schubert.lib";
ring r = 0,x,dp;
multipleCover(1);
==> 1
multipleCover(2);
==> 1/8
multipleCover(3);
==> 1/27
multipleCover(4);
==> 1/64
multipleCover(5);
==> 1/125
multipleCover(6);
==> 1/216
See also: linesHypersurface; rationalCurve.