regularSequenceCheck  how much of a list is regular
Synopsis

 Usage:
 regularSequenceCheck(X,A)

Inputs:

Outputs:
Description
Given a list
X, the function
regularSequenceCheck gives an integer indicating how many initial elements of a
List form a regular sequence.
i1 : A = ZZ[x_1..x_4]/(x_4^2)
o1 = A
o1 : QuotientRing

i2 : regularSequenceCheck({x_1..x_4},A)
o2 = 3

This symbol is provided by the package Depth.
Caveat
regularSequenceCheck merely checks the injectivity of the maps in question. It does not check to see if XA = A.
Ways to use regularSequenceCheck :

"regularSequenceCheck(List,Module)"

"regularSequenceCheck(List,Ring)"

"regularSequenceCheck(Matrix,Module)"

"regularSequenceCheck(Matrix,Ring)"