Intersection of all closed intervals containing the open interval (0,1)

[@stevemills1960]

How can a

[@oceansofmath4732]

We need the closed interval [a,b] to contain the open interval (0,1). This means 'a' needs to be to the left of 0 on the number line, and 'b' needs to be to the right of 1 on the number line. Hopefully this helps answer your first question.