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- Label each of the following statements as either true or false. Every upper bound of a nonempty set is a least upper bound.Suppose thatis an onto mapping from to. Prove that if ℒ, is a partition of, then ℒ, is a partition of.Label each of the following statements as either true or false. A mapping is onto if and only if its codomain and range are equal.
- Exercises 33. Prove Theorem : Let be a permutation on with . The relation defined on by if and only if for some is an equivalence relation on .[Type here] 18. Prove that only idempotent elements in an integral domain are and . [Type here]Label each of the following statements as either true or false. Every least upper bound of a nonempty set S is an upper bound.
- 10. Let and be mappings from to. Prove that if is invertible, then is onto and is one-to-one.Let V be the set of all positive real numbers. Determine whether V is a vector space with the operations shown below. x+y=xyAddition cx=xcScalar multiplication If it is, verify each vector space axiom; if it is not, state all vector space axioms that fail.8. a. Prove that the set of all onto mappings from to is closed under composition of mappings. b. Prove that the set of all one-to-one mappings from to is closed under composition of mappings.
- 6. Prove that if is a permutation on , then is a permutation on .Prove Theorem 1.40: If is an equivalence relation on the nonempty set , then the distinct equivalence classes of form a partition of .Take this test to review the material in Chapters 4 and 5. After you are finished, check your work against the answers in the back of the book. Prove that the set of all singular 33 matrices is not a vector space.