Semigroup with involution: Difference between revisions

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this should probably be some kind of history section, but there's not much else along these lines right now
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:<math>y^\dagger =
\begin{cases}
\theta(y) & \mboxtext{if } y \in X \\
\theta^{-1}(y) & \mboxtext{if } y \in X^\dagger
\end{cases}</math>