powseries
reversion
reversion of formal power series
Calling Sequence
Parameters
Description
Examples
reversion(a, b)
a
-
formal power series
b
(optional) formal power series
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, .
Since reversion is the inverse of composition, composition of the result into a will give b.
Note that must be , must be , and must be . If not, the reversion is not well defined and reversion returns an error message.
The command with(powseries,reversion) allows the use of the abbreviated form of this command.
See Also
solve/series
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