#### D.15.25.2 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
    ==>
    ==> [3]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [4]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [5]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [6]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [7]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [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
    ==>
    ==> [12]:
    ==>    phi.relations  ->  phi.over/phi.source
    ==>
    ==> [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
    ==>

User manual for Singular version 4.4.1, 2025, generated by texi2html.