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D.5.1.4 rncAntiCanonicalMap

Procedure from library paraplanecurves.lib (see paraplanecurves_lib).

Usage:
rncAntiCanonicalMap(I); I ideal

Assume:
I is a homogeneous ideal in the basering
defining a rational normal curve C in PP^n.

Note:
The procedure will fail or give a wrong output if I is not the ideal of a rational normal curve.

Return:
ideal defining the anticanonical map C --> PP^(n-2).
Note that the entries of the ideal should be considered as representatives of elements in R/I, where R is the basering.

Theory:
The anti-canonical map of a rational normal curve
maps C isomorpically to a rational normal curve in PP^(n-2).

Example:
 


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