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Big cup

The big union symbol

\begin{equation*} \bigcup_{i = 1}^{n} S_i = \bigcup_{S \in \mathcal{U}} S = S_1 \cup \ldots \cup S_n \end{equation*}

with \(\mathcal{U} = \{S_1, \ldots, S_n\}\).


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