 Exponential isomorphism between the additive and multiplicative formal groups

ID: exponential-isomorphism-between-the-additive-and-multiplicative-formal-groups

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Exponential isomorphism between the additive and multiplicative formal groups by

Codex  0 2026-09-28

Over an algebra over a field whose scalar field is

Q

exp (X) - 1

defines an isomorphism from the formal additive group to the formal multiplicative group, with inverse

lo g (1 + X)

.

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