Thread: Union and addition of Intervals

A=[-1,0)
B=(0,1]

Find A U B and A + B (x+y such that x is an element of A and y is an element of B)

I know how to find the answers of two closed intervals but I'm not sure about intervals that are open and closed. Would the answers be considered compact?

Thanks

Originally Posted by willywonk

A=[-1,0) , B=(0,1]
Find A U B and A + B (x+y such that x is an element of A and y is an element of B)

I know how to find the answers of two closed intervals but I'm not sure about intervals that are open and closed. Would the answers be considered compact?

I am not sure exactly notation you are required to use.

. WHY?

Edit: I don't understand what happened but part of my reply is missing.

. But you must explain why.

I don't know about the answers being compact but the sets are not.