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D.15.1.16 arrCone
Procedure from library arr.lib (see arr_lib).
- Usage:
- arrCone(A);
arrCone(A, ring_variable); arr A arrangement in variables x_1...x_n;
- Return:
- arr, the coned hyperplane Arrangement cA with respect to the given
ring_variable, or the last ring_variable if none was given.
- Note:
- The hyperplanes are homogenized w.r.t. v and a new hyperplane
H = ker(x_n+1) is added.
Example:
| | LIB "arr.lib";
ring R = 0,(x,y,z),dp;
arr A = ideal(x+1, x,x-2,x-1);
arrCone(A, y);
==> _[1]=x+y
==> _[2]=x
==> _[3]=x-2y
==> _[4]=x-y
==> _[5]=y
==>
arr B= ideal(x,y,x+y-1);
arrCone(B);
==> _[1]=x
==> _[2]=y
==> _[3]=x+y-z
==> _[4]=z
==>
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See also:
arrCone;
arrDecone;
arrEssentialize;
arrIsEssential;
arrRestrict.
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