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Hello. Can anyone tell me please what this operator in the picture
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Hello.

Can anyone tell me please what this operator in the picture means? Much appreciated.
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>>7785683
It's the symbol for union of sets.
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>>7785690

I see. Thanks!
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>>7785696
https://www.google.de/?gfe_rd=cr&ei=Sz2ZVr73LcOH8Qek2IrYBw&gws_rd=ssl#q=maths+what+is+the+big+u
please learn to google next time.
>>
>>7785698
and make sure it's German google.
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