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How do you do interval notation?

 Jun 22, 2019
 #1
avatar+7725 
+1

\(x\in (a, b)\implies a < x < b\\ x \in (a, b] \implies a < x \le b\\ x \in [a, b) \implies a \le x < b\\ x \in [a,b] \implies a \le x \le b\)

 

\(\cup\text{ means or}\\ \cap\text{ means and}\)

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 Jun 22, 2019
 #2
avatar+75 
-3

arnt those things union and intersection?

CuteDramione  Jun 22, 2019
 #3
avatar+7725 
+1

Yes. Glad you know these. 

The union of few intervals means that x satisfies any of them, so it means "or".

The intersection of few intervals means that x must satisfy all of them, so it means "and".

MaxWong  Jun 22, 2019
 #4
avatar+75 
-3

:O that is a mouthful

CuteDramione  Jun 22, 2019

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