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Are there multiple conjugacy classes of order 2 elements in the smooth automorphism group of...

Consider the group $\text{Aut}\mathbb{R}$ of smooth invertible maps from $\mathbb{R}$ to $\mathbb{R}$. If $f\in\text{Aut}\mathbb{R}$ has order 2 ($f$ is an involution), is $f$ conjugate to $g(x)=-x$? …
Anon E. Mous's user avatar