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D.10.1.10 closed_points

Procedure from library brnoeth.lib (see brnoeth_lib).

Usage:
closed_points(I); I an ideal

Return:
list of prime ideals (each a Groebner basis), corresponding to the (distinct affine closed) points of V(I)

Note:
The ideal must have dimension 0, the basering must have 2 variables, the ordering must be lp, and the base field must be finite and prime.
It might be convenient to set the option(redSB) in advance.

Example:
 
LIB "brnoeth.lib";
ring s=2,(x,y),lp;
// this is just the affine plane over F_4 :
ideal I=x4+x,y4+y;
list L=closed_points(I);
// and here you have all the points :
L;
==> [1]:
==>    _[1]=y
==>    _[2]=x
==> [2]:
==>    _[1]=y
==>    _[2]=x+1
==> [3]:
==>    _[1]=y
==>    _[2]=x2+x+1
==> [4]:
==>    _[1]=y+1
==>    _[2]=x
==> [5]:
==>    _[1]=y+1
==>    _[2]=x+1
==> [6]:
==>    _[1]=y+1
==>    _[2]=x2+x+1
==> [7]:
==>    _[1]=y2+y+1
==>    _[2]=x+1
==> [8]:
==>    _[1]=y2+y+1
==>    _[2]=x+y
==> [9]:
==>    _[1]=y2+y+1
==>    _[2]=x+y+1
==> [10]:
==>    _[1]=y2+y+1
==>    _[2]=x
See also: triang_lib.


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