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This may be a silly question and I am able to interpret the intention of the notation but I am just curious exactly what it is.

I am attaching an image of the page out of my text book and it is near the bottom. C = C1 U C2.

Sorry again if this is a silly question, I just wanted to make sure I understand this notation outside the context of this problem. I am sure I have seen it before but I am still not sure.

Thanks,

Rob

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# Question about a notation.

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