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D.14.1.31 arrIsFree
Procedure from library arr.lib (see arr_lib).
- Usage:
- arrIsFree(A); arr A, multarr A
- Return:
- [0,1] 1 if the (multi-)arrangement is free, i.e. Der(A) is a free module
- Note:
- only defined for central arrangements
Example:
| LIB "arr.lib";
ring R = 0,(x,y,z),dp;
arr A3 = arrBoolean(3);
arr B3 = arrTypeB(3);
arr G = ideal(x,y,z,x+y+z);
arrIsFree(A3);
==> 1
arrIsFree(B3);
==> 1
arrIsFree(G);
==> 0
| See also:
arrDer;
arrExponents;
arrIsFree.
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