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`desing/exchange`

Performing exchange operation on a chart-record with chart U.

Input:
 
O
a chart-record,
f
a polynomial form k[S] (a representative of an element of k[U]),
p
an index to the IND member of the chart,
a
a polynomial from k[S], the inverse of the partial derivative of f w.r.t. IND[p].
Output:
a new chart-record with IND[p] exchanged to f.
The input chart is moved to chartHistory and the operation is registered in chartTree. The value of globalChartCounter is increased by one.
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