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D.15.20.5 sPiece
Procedure from library stanleyreisner.lib (see stanleyreisner_lib).
- Assume:
- I is the ideal generated by the monomials w.r.t. faces, a-b is the degree
of the graded piece.
- Return:
- graded piece (of degree a-b) of second order deformation on ideal I.
- Theory:
- The procedure will compute the graded pieces of the second order deformaiton
which has degree (a-b).
Example:
| | LIB "stanleyreisner.lib";
ring R=0,(x(1..4)),lp;
ideal i=x(1),x(2),x(3),x(4),x(1)*x(4),x(2)*x(4),x(1)*x(3),x(2)*x(3);
SecondOrderDeformation psi=sPiece(i,x(4)^2,x(1)*x(2));
psi;
==> phi.relations -> phi.over/phi.source
==>
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