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based on an earlier version of the Wolfram Language.
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ComposeSeries

ComposeSeries[series1, series2, ...]
composes several power series.
  • ComposeSeries[series1, series2, ...] effectively replaces the variable in series1 by series2 and so on.
  • Two series can only meaningfully be composed when the point about which the first series is expanded corresponds to the limiting value of the second series at its expansion point.
The limiting value of the second series must coincide with the expansion point of the first series:
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