s^n
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If n is 0, the formal series returned is 1 with the same precision as s. If n is negative, then s needs to have its constant part equal to either +1 or -1, otherwise an error occurs.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/FormalGroupLaws.m2:588:0.