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# StartDimension -- optional input for cascade and numericalIrreducibleDecomposition

- Usage:
    `cascade(..., StartDimension => ZZ) or numericalIrreducibleDecomposition(..., StartDimension =>ZZ)`

## Description

Optional argument for cascade and numericalIrreducibleDecomposition. These methods search for positive dimensional components starting at the StartDimension and then considering all the subsequent lower dimensions.

The default value for StartDimension is the number of variables in the system minus one.

If the user has a good idea about the top dimension, using a smaller StartDimension than the default will reduce the computational time.

## Functions with optional argument named StartDimension:

- cascade(...,StartDimension=>...) -- Option to specify the dimension to begin searching for positive dimensional components
- numericalIrreducibleDecomposition(...,StartDimension=>...) -- Option to specify the dimension to begin searching for positive dimensional components

## For the programmer

The object StartDimension is a symbol.

The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/PHCpack/PHCpackDoc.m2:216:0.