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Performing partial differentiation w.r.t. the parameter system of a chart.

**Input:**-
**S**- a list of variables,
**f**- a polynomial from
*k[S]*, **p**- an index to the
`IND`member of the chart, **PDER**- a list of lists of polynomials (the corresponding member of the chart).

**Output:**- the partial derivative of
`f`w.r.t.`IND[p]`.