I am working on problems in my complex analysis book (Conway), and I'm not sure what this notation $D^{-}$ means.
Earlier, $D_{-}$ is defined to be the set $\{z \in \mathbb{C} : Im z < 0\}.$
2026-05-05 11:38:39.1777981119
What does the notation $D^{-}$ mean?
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Almost certainly, the author means $\bar D$, the closure of the unit disc, i.e. the set $$\bar D = \{ z : |z| \le 1 \}.$$