Methods for Function 'rfseries'

&-operator compute inversion of formal series *sum of ap*X^p*, where *p=(p1,...,pn)*. The condition of invertible of formal series is *a0 not equal 0*. If the condition is not fulfilled than error occurs. The numeric argument of this operation response for maximum exponent of inversion. In example, `a^5`

for 2 variables, in this case the highest exponent of inversion of `a`

is (5,5).

`signature(e1 = "fseries", e2 = "numeric")`

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