&-methods: Inversion of formal series
Description
&-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).
Methods
signature(e1 = "fseries", e2 = "numeric")-