System of parameters
In mathematics, a system of parameters for a local Noetherian ring of Krull dimension d with maximal ideal m is a set of elements x1, ..., xd that satisfies any of the following equivalent conditions:
 m is a minimal prime over (x1, ..., xd). The radical of (x1, ..., xd) is m.
 Some power of m is contained in (x1, ..., xd). (x1, ..., xd) is m-primary. Every local Noetherian ring admits a system of parameters. It is not possible for fewer than d elements to generate an ideal whose radical is m because then the dimension of R would be less than d.

If M is a k-dimensional module over a local ring, then x1, ..., xk is a system of parameters for M if the length of  is finite. General references

References

Commutative algebra
Ideals (ring theory)