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`desing/pder`

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].

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