Description
The log-canonical threshold of
A defined by a polynomial
f is the least number
c for which the multiplier ideal
J(f^c) is nontrivial.
Let's consider Example 6.3 of Berkesch and Leykin from arXiv:1002.1475v2:
i1 : R := QQ[x,y,z];
|
i2 : A := arrangement ((x^2 - y^2)*(x^2 - z^2)*(y^2 - z^2)*z);
|
i3 : lct A
3
o3 = -
7
o3 : QQ
|
note that
A is allowed to be a multiarrangement.