Hi I am studying Real Analysis and sometime i see a _ on top of a function or a set and i don't understand what does it mean or it doesn't mean anything and it is just an arbitrary symbol.
Thanks you
2026-05-02 06:51:59.1777704719
Real Analysis - Notation
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is $M $ a subset of a metric space, then $\overline{M}$ denotes the closure of $M$.
for a complex number $z$, $\overline{z}$ denotes the conjugate complex number.