Give examples of two sets that are not Jordan measurable such that the union is Jordan measurable

Give examples of two sets that are not Jordan measurable such that the union is Jordan...
Give an example to show that a union of countable sets need not
be countable. (Obviously your example must involve infinitely many
sets.)
4. Give an example to show that a union of countable sets need not be countable. (Obvi- ously your example must involve infinitely many sets.)
Give an efficient algorithm to compute the union of sets A and B, where n = max(|A|, |B|). The output should be an array of distinct elements that form the union of the sets, such that they appear exactly once in the union. Assume that A and B are unsorted. Give an O(n log n) time algorithm for the problem.
2. Prove that a finite union of compact sets is compact. Give an example of a countable union of compact sets which is not compact. Book Problems: Chapter 2, Problems 12, 13, 16, 17, 19, 22
2. Let {An}n>1 and {Bn}n>ı be two sequences of measurable sets in the measurable space (12,F). Set Cn = An ñ Bn, Dn = An U Bn: (1) Show that (Tim An) ^ ( lim Bm) – lim Cn (lim An) ( lim Bu) C lim Dm and 100 noo (2) Show by example the two inclusions in (1) can be strict.
Please give good proofs, thank you!
Problem 15.4. Give three proofs that the union of two compact sets is a compact set. One proof for each a the three criteria in the theorem. So prove the union of two compact sets is a compact set, using: (a) the closed and bounded criterion; (b) sequential compactness; (c) topological compactness
3. Let E E Lm* (Lebesgue measurable set). Prove that there exist a set G (a countable intersection of open sets), and a set F (a countable union of closed sets) such that F CE C G and m* (F) the Lebesgue measure of a set Hint: The Lebesgue measure can be calculated in terms of open and closed sets m* (E) m* (G), where m* denotes
3. Let E E Lm* (Lebesgue measurable set). Prove that there exist a...
give examples of credit rating agencies in Jordan? are rating agencies paid by the companies they rate, do rating agencies act as consultants to the company they rate?
Problem 19. Prove that there exists a Jordan measurable set contained in IR which is not a Borel set.
3. Show that if S, and S2 are Jordan measurable, then so are Si U S2 and Sin S2.
Show that if there is two sets S1 and S2, S1 and S2 are Jordan regions so is S1 \ (S1 ∩ S2).