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D.15.2.21 arrEssentialize

Procedure from library arr.lib (see arr_lib).

Usage:
arrEssentialize(A); arrangement A;

Return:
essential arrangement by transformation

Note:
A has to be non-empty.

Example:
 
LIB "arr.lib";
ring S = 0,(x,y,z),dp;
arr A=arrBraid(3);
arrEssentialize(A);
==> _[1]=x-y
==> _[2]=x
==> _[3]=y
==> 
arr B = ideal(x+y+z,x,y+z);
arrEssentialize(B);
==> _[1]=x+y
==> _[2]=x
==> _[3]=y
==>
See also: arrCone; arrDecone; arrEssentialize; arrIsEssential; arrRestrict.