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D.15.2.41 arrPoincare
Procedure from library arr.lib (see arr_lib).
- Usage:
- arrPoincare(A); arr A
- Return:
- [intvec] The Poincare polynomial as integer vector of the arrangement, which
is equal to the second kind Poincare-Series of the Orlik-Solomon Algebra.
Example:
| | LIB "arr.lib";
ring R = 0,(x,y,z,u,v),dp;
arr A = arrBraid(5);
intvec v = arrPoincare(A);
(1+x)*(1+2x)*(1+3x)*(1+4x);
==> 24x4+50x3+35x2+10x+1
v;
==> 1,10,35,50,24
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See also:
arrBoundedChambers;
arrChambers;
arrPoincare.
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