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