
#1
Dec1313, 08:23 PM

P: 2

Can anyone please give a succinct and clear description on this? I'm a little confused...




#2
Dec1313, 08:30 PM

Newcomer
P: 341

I don't want to be a smartass, but look at http://en.wikipedia.org/wiki/Interval_%28mathematics%29
Can you specify why that link is not helpful, and what you don't understand? 



#3
Dec1313, 09:48 PM

P: 448

http://www.purplemath.com/modules/setnotn.htm
Set notation. This will help you read the wiki article. Need to know where you at with it to be able to help. Do you understand (a, b] means a isn't included in the interval but b is? 



#4
Dec1513, 06:55 PM

Math
Emeritus
Sci Advisor
Thanks
PF Gold
P: 38,898

Interval notation
(a, b) means "all numbers strictly between a and b". It can also be written as [itex]\{x a< x< b\}[/itex].
[a, b) means "all numbers strictly between a and b and the number a. It can also be written as [itex]\{x a\le x< b\}[/itex]. (a, b) means "all numbers strictly between a and b and the number b. It can also be written as [itex]\{ x a< x\le b\}[/itex]. [a, b] means "all numbers strictlhy between a and b and both the number a and the number b. It can also be written as [itex]\{x a\le x\le b\}[/itex]. In short, all of these contain the interval between a and b. "[" and "]" mean "include this end point". "(" and ")" mean "do not include this point". 


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