The highlighted symbol is found in Durrett's "Probability: Theory and Examples" (4th edition).
What does it mean?
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Incognito
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1Looks like a misprint for $\bigcup_{i\ge1}$. – Angina Seng Mar 11 '18 at 17:42
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3The author defines "+" in this context as disjoint union (see the top of page 4). – quasi Mar 11 '18 at 17:45
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@quasi, is this definition explicit in somewhere in the book? – Incognito Mar 11 '18 at 17:46
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3Yes.${}{}{}{}{}$ – quasi Mar 11 '18 at 17:46