D.15.1.32 arrExponents

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

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