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 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: 21,020 Thanks: 2256 One could also ask what A is and what B is.
September 9th, 2015, 01:42 AM   #3
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Quote:
 Originally Posted by skipjack one could also ask what a is and what b is.
a=[2,5[
b= [3,5,7]

September 9th, 2015, 02:04 AM   #4
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Quote:
 Originally Posted by med1student [2,5[ and [3,5,7] A U B =? what's this [2,5[ ?
Where did you find the question?

September 9th, 2015, 05:14 AM   #5
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Quote:
 Originally Posted by Yash Malik Where did you find the question?
It's actually for my homework

 September 9th, 2015, 05:17 AM #6 Math Team     Joined: May 2013 From: The Astral plane Posts: 2,299 Thanks: 960 Math Focus: Wibbly wobbly timey-wimey stuff. [2,5[ is all x such that $\displaystyle 2 \leq x < 5$ -Dan Thanks from Yash Malik
September 9th, 2015, 05:29 AM   #7
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Quote:
 Originally Posted by topsquark [2,5[ is all x such that $\displaystyle 2 \leq x < 5$ -Dan

 September 9th, 2015, 05:53 AM #8 Math Team     Joined: May 2013 From: The Astral plane Posts: 2,299 Thanks: 960 Math Focus: Wibbly wobbly timey-wimey 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
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Quote:
 Originally Posted by med1student Ok and thank you got it . How can you explain this C = ]3, 5] what does that mean ? *this is for another problem
Some texts use (3, 5] for this notation as well. ]3,5] is all x such that $\displaystyle 3 < x \leq 5$. Beyond that I have no idea what you are referring to until you post the actual question.

-Dan

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