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D.15.15.5 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
==>