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D.15.15.2 T2

Procedure from library stanleyreisner.lib (see stanleyreisner_lib).

Usage:
T2(h); h = ideal.

Assume:
I is the ideal generated by the monomials w.r.t. faces.

Return:
second order deformation on ideal I.

Theory:
The procedure will compute the second order deformaiton.

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);
list L=T2(i);
L;
==> [1]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [2]:
==>    phi.relations  ->  phi.over/phi.source
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==> [3]:
==>    phi.relations  ->  phi.over/phi.source
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==> [4]:
==>    phi.relations  ->  phi.over/phi.source
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==> [5]:
==>    phi.relations  ->  phi.over/phi.source
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==> [6]:
==>    phi.relations  ->  phi.over/phi.source
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==> [7]:
==>    phi.relations  ->  phi.over/phi.source
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==> [8]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [9]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [10]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [11]:
==>    phi.relations  ->  phi.over/phi.source
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==> [12]:
==>    phi.relations  ->  phi.over/phi.source
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==> [13]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [14]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [15]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [16]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [17]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [18]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [19]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [20]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [21]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [22]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [23]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [24]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [25]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [26]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [27]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [28]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [29]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [30]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [31]:
==>    phi.relations  ->  phi.over/phi.source
==> 
==> [32]:
==>    phi.relations  ->  phi.over/phi.source
==>