topComponents M
The method used is that of Eisenbud-Huneke-Vasconcelos, in their 1993 Inventiones Mathematicae paper.
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If $M$ is a module in a polynomial ring $R$, then the implementations of topComponents and removeLowestDimension are based on the following observations:
The object topComponents is a method function.
The source of this document is in PrimaryDecomposition/doc.m2:750:0.