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- 9. The definition of an even integer was stated in Section 1.2. Prove or disprove that the set of all even integers is closed with respect to a. addition defined on . b. multiplication defined on .Prove that the statements in Exercises 116 are true for every positive integer n. a+ar+ar2++arn1=a1rn1rifr125. Prove that if and are integers and, then either or. (Hint: If, then either or, and similarly for. Consider for the various causes.)
- Let A be a set of integers closed under subtraction. a. Prove that if A is nonempty, then 0 is in A. b. Prove that if x is in A then x is in A.31. Prove statement of Theorem : for all integers and .21. A relation on a nonempty set is called irreflexive if for all. Which of the relations in Exercise 2 are irreflexive? 2. In each of the following parts, a relation is defined on the set of all integers. Determine in each case whether or not is reflexive, symmetric, or transitive. Justify your answers. a. if and only if b. if and only if c. if and only if for some in . d. if and only if e. if and only if f. if and only if g. if and only if h. if and only if i. if and only if j. if and only if. k. if and only if.
- Let be as described in the proof of Theorem. Give a specific example of a positive element of .Let a and b be constant integers with a0, and let the mapping f:ZZ be defined by f(x)=ax+b. Prove that f is one-to-one. Prove that f is onto if and only if a=1 or a=1.Prove that the equalities in Exercises 111 hold for all x,y,zandw in Z. Assume only the basic postulates for Z and those properties proved in this section. Subtraction is defined by xy=x+(y). x0=0