isCI -- whether the ring is complete intersection

Usage:

isCI R or isCI I
Inputs:
- R, a quotient ring, of a polynomial algebra by an ideal contained in the irrelevant maximal ideal
Outputs:
- a Boolean value, whether the local ring obtained by localizing R at the irrelevant maximal ideal is complete intersection

Description

Checks if the local ring obtained by localizing R at the irrelevant maximal ideal is complete intersection. It is also possible to call the function on the defining ideal of R; see isCI(Ideal).

i1 : Q = QQ[x,y,z];

i2 : isCI (Q/ideal(x^2,x*y,y*z,z^2))

o2 = false

i3 : isCI (Q/ideal(x^2,y^2))

o3 = true

Ways to use isCI:

isCI(QuotientRing)
isCI(Ideal) -- whether the ring is complete intersection

For the programmer

The object isCI is a method function.

The source of this document is in TorAlgebra.m2:1188:0.