- #1
sutupidmath
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Problem. Let E be the closed unit square. Prove that every open subset of E is measurable.
I know that one way to show that a set, say A, is measurable is to show that its outer and inner measure coincide; another way is to exibit an elementary set B such that
[tex] \mu(A\Delta B)< \epsilon.[/tex]
However, I am not sure where to start. Any hints would be appreciated?
I know that one way to show that a set, say A, is measurable is to show that its outer and inner measure coincide; another way is to exibit an elementary set B such that
[tex] \mu(A\Delta B)< \epsilon.[/tex]
However, I am not sure where to start. Any hints would be appreciated?