September 9th, 2015, 12:55 AM  #1 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0  Confused
[2,5[ and [3,5,7] A U B =? what's this [2,5[ ? 
September 9th, 2015, 01:30 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,805 Thanks: 2150 
One could also ask what A is and what B is.

September 9th, 2015, 01:42 AM  #3 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0  
September 9th, 2015, 02:04 AM  #4 
Senior Member Joined: Sep 2015 From: 4th Dimension Posts: 146 Thanks: 13 Math Focus: Everything (a little bit)  
September 9th, 2015, 05:14 AM  #5 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0  
September 9th, 2015, 05:17 AM  #6 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,226 Thanks: 908 Math Focus: Wibbly wobbly timeywimey stuff. 
[2,5[ is all x such that $\displaystyle 2 \leq x < 5$ Dan 
September 9th, 2015, 05:29 AM  #7 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0  
September 9th, 2015, 05:53 AM  #8 
Math Team Joined: May 2013 From: The Astral plane Posts: 2,226 Thanks: 908 Math Focus: Wibbly wobbly timeywimey stuff. 
$\displaystyle A \cup B$, loosely speaking, is the set of all members of A and B. Dan 
September 9th, 2015, 05:55 AM  #9 
Member Joined: Aug 2015 From: Podgorica Posts: 61 Thanks: 0 
Ok and thank you got it . How can you explain this C = ]3, 5] what does that mean ? *this is for another problem 
September 9th, 2015, 06:35 AM  #10  
Math Team Joined: May 2013 From: The Astral plane Posts: 2,226 Thanks: 908 Math Focus: Wibbly wobbly timeywimey stuff.  Quote:
Dan  

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