powseries[reversion] - reversion of formal power series
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Calling Sequence
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reversion(a, b)
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Parameters
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a
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-
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formal power series
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b
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-
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(optional) formal power series
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Description
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The function reversion(a, b) returns the formal power series that is the reversion of a with respect to b. If b is not specified then it is assumed to be the formal power series with one nonzero coefficient, .
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Since reversion is the inverse of composition, composition of the result into a will give b.
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The command with(powseries,reversion) allows the use of the abbreviated form of this command.
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Examples
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