Question: 4. For this problem, let f : R - R be a function. We say that a non-empty set U C R is ajar if

4. For this problem, let f : R - R be a function. We say that a non-empty set U C R is ajar if Vu EU, 3r > 0 such that (u - rut r) CU. (a) Show that (0, 2) is ajar. (b) Find a set that is not ajar. You don't need to prove it. My set is

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