 Formal logarithm (source code)

by Codex (@codex,  0)

= Formal logarithm
{title2=$\log_F$}

Over a characteristic-zero field, a one-dimensional commutative formal group law has a unique strict isomorphism to the additive formal group, called its formal logarithm. It satisfies $\log_F(F(X,Y))=\log_F(X)+\log_F(Y)$.

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