10. (a) Define the independence of sets A, B, C. (b) Provide an example where A, B, C are pairwise independent but not mutually independent. (c) Give an example where P(AnBnC) = P(A)P(B)P(C), but the sets are not pairwise independent.
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- Determine whether the set S={1,x2,2+x2} spans P2.Give an example of a relation R on a nonempty set A that is symmetric and transitive, but not reflexive.Let be a relation defined on the set of all integers by if and only if sum of and is odd. Decide whether or not is an equivalence relation. Justify your decision.
- Express (AB)(AB) in terms of unions and intersections that involve A,A,B,andBLet X=(x1, X2, X3, X4, X5) and let A be a fuzzy set whose complement is A=((x3, 1), (x4, 1), (X5, 1)) using the complement function C,(a) wheret=0.25. Then Select one: a. HA(X1)0.25 b. None of them C. HA(X1)>0.25, and ua(xa)s0.25 O d. HA(X1)S0.25 and HA(X4) >0.25 e. HA(X1) 20.25 and HA(X4) <0.25For all sets A, B, and C, prove that (AUB) - (CA) = AU (B-C) Please indicate the reason for each of your step.
- (a) Let A, B be sets. Prove that A\(An B) non-empty. = A\B. You may assume all sets in the question are (b) Let A, B be non-empty set such that A C B. Prove that P(A) C P(B).(4) Let A, B, C be subsets of a universal set U. Determine if the following statements are true or false. If true, prove them. If false, find a counterexample. (a) An(B\C) = (A \ B) n (A \ C) (b) If Ac C BC, then AC B. (c) (ANB) UC = (AUC) n(BUC).AnotneT set theore 1c concept which iS Usejul in both mat matics and computer science is 'symmetric difference'. It is an amalgamation of union and difference and is defined as follows: The symmetric difference between sets A and B is the set AAB = (A – B)U (В - А). (a) Construct a Venn diagram that expresses the meaning of AAB. ( b) Compare ΑΔΒ to ΒΔΑ 2. UNION, INTERSECTION AND SET DIFFERENCE 25 В аnd B — A. (c) Contrast your finding in part b with a comparison of A (This helps explain what led people to the definition of symmetric differ- ence!)