What does the symbol $\Bbb C\setminus\{0\}$ mean? Here, $\Bbb C$ is the domain of complex numbers and the context is showing complex numbers follow pretty much the same rules as real calculus.
2026-04-02 19:43:41.1775159021
Complex Analysis Notation
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For any two sets $A$ and $B$, $A\setminus B$ is the set of those elements of $A$ that don't belong to $B$.
In particular, $\mathbb C\setminus\{0\}=\{z\in\mathbb C\,|\,z\neq0\}$.