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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 \(\mathcal{U} = \{S_1, \ldots, S_n\}\).
Home / Set theory / Union
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 \(\mathcal{U} = \{S_1, \ldots, S_n\}\).