|  |  D.14.1.31 arrIsFree Procedure from libraryarr.lib(see  arr_lib).
 
Example: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
 See also:
 arrDer;
 arrExponents;
 arrIsFree.|  | 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
 | 
 
 |