Find two open sets A and B, such that A is subset of B, A is not equal

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The discussion focuses on finding two open sets A and B where A is a subset of B, A is not equal to B, and the measure m(A) equals m(B). The proposed sets A=(0,2) and B=(0,1) U (1,2) were initially incorrect as they resulted in B being a subset of A. The correct approach requires identifying sets that satisfy the conditions of subset and measure equality while ensuring they are distinct.

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Find two open sets A and B, such that A is subset of B, A is not equal to B, and m(A)=m(B)

Can I use these two sets?

A=(0,2) B=(0,1) U (1,2)

thanks
 
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Almost. Your example has B a subset of A. You want the reverse.
 


you are right, thanks
 

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