Exercise 6.40. Let E be a nonempty subset of R that is bounded above. Prove that if a = sup E, then a EE.
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- 28. Let where and are nonempty. Prove that has the property that for every subset of if and only if is onto. (Compare with Exercise 15c.) Exercise 15c. c. For this same and show that.Suppose A ⊂ R is both closed and bounded, prove that A has the Heine-Borel PropertyFind an example of a bounded convex set S in R2 such that its profile P is nonempty but conv P ≠ S.
- Prove that if A is a nonempty set which is bounded below by 3 then B = {x ∈ R | ∃a ∈ A, b = (1/a)} is bounded above by (1/3).Take any r > 0 and any c ∈ R. Show that the r-ball Br( c ) is an open subset of R.Let O be the collection of intervals Ia = (a,∞) where a ∈ R along with I∞ = ∅ andI−∞ = R. Does this collection define a topology? If so, prove that it does. Otherwise, justify why itdoes not. In case it does, describe A given A ⊂ R.
- Give an example of a set X and topologies T1 and T2 on X such that T1 union T2 is not a topology on XA. Let H be the set of all points (x, y) in ℝ2 such that x2 + 3y2 = 12. Show that H is a closed subset of ℝ2 (considered with the Euclidean metric). Is H bounded?Let E be a subset of X, where X is a metric space. Show the limit points of E are the same as the limit points of the closure of E. That is, show E'=(E U E')'