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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?



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

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

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

  • $\begingroup$ 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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