complexModuloRegularSequence4 -- set-up the minimal free resolution modulo $x_0,x_1$ in the case of a fat base point

Synopsis

Usage:

complexModuloRegularSequence4(SR,L)
Inputs:
- SR, a ring,
- L, a list, of length 3 whose entries are either 0 or 1
Outputs:
- D, a chain complex, the minimal free resolution modulo the regular sequence $x_0,x_1$

If $L = \{0,0,0\}$, then the middle complex is simply the direct sum of the minimal free resolutions of a coordinate point in $\mathbb{P}^3$.