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It's very simple. I don't know how to interpret these symbols (highlighted in image below) in the context of this example. So, can someone tell me how to read them?

example

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marked as duplicate by Community Oct 20 '18 at 13:59

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  • $\begingroup$ e.g. $\bigcup_{j=1}^3A_j$ stands for $A_1\cup A_2\cup A_3$. $\endgroup$ – drhab Oct 20 '18 at 13:54
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We indicate with

  • $\bigcup_i A_i$ the UNION of the sets $A_i$ that is $$A_1\cup A_2\cup\ldots\cup A_n$$

  • $\bigcap_i A_i$ the INTERSECTION of the sets $A_i$ that is

$$A_1\cap A_2\cap\ldots\cap A_n$$

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  • $\begingroup$ that was useful, thanks $\endgroup$ – Eslam Medhat Oct 20 '18 at 14:00
  • $\begingroup$ @EslamMedhat You are welcome! Refer also to the given link and to the duplicate which contains more information. Bye $\endgroup$ – user Oct 20 '18 at 14:01

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