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D.15.2.32 arrExponents

Procedure from library arr.lib (see arr_lib).

Usage:
arrExponents(A); arr A, multarr A

Return:
[intvec] The exponents of a free (multi-) arrangement, i.e. the degrees of a basis of D(A) the derivation 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);
arrExponents(A3);
==> 1,1,1
arrExponents(B3);
==> 1,3,5
See also: arrDer; arrExponents; arrIsFree.