compositionInverse(s)
The FormalSeries s must be in one variable and have a zero constant coefficient and a coefficient +1 or -1 in degree 1. Then, compositionInverse computes the inverse of s for the composition of formal series, up to the precision of s.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/FormalGroupLaws.m2:709:0.