If I wanted to show this would it look something like
Whatchamacallets = (Things + Stuff + Pandas)
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2$\bigcup_{x\in I} A_x$ would be the notation for the union of a bunch of sets $A_x$. In your example you could also do $W=T\cup S\cup P$. – paw88789 Aug 28 '14 at 21:31
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Thanks. If you want to toss this in as an answer I will mark it for you. Even though it is a math softball it was something I needed. – Charles Ferentchak Aug 28 '14 at 21:39
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No problem. Glad to help! – paw88789 Aug 28 '14 at 21:43
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If you're familiar with the indexed sum notation that looks like:
$$\sum_{i=0}^n x^2 + 1$$
There's a similar union notation.
$$\bigcup_{i=0}^n S_i$$
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