16. Prove using the First Principle of Math is divisible by 4 for all integers n ≥ 1 6.7-2.3" Induction (weak induction):
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- 30. Prove statement of Theorem : for all integers .5. Let be the relation “congruence modulo ” defined on as follows: is congruent to modulo if and only if is a multiple of , we write . a. Prove that “congruence modulo ” is an equivalence relation. b. List five members of each of the equivalence classes and .Show that the converse of Eisenstein’s Irreducibility Criterion is not true by finding an irreducible such that there is no that satisfies the hypothesis of Eisenstein’s Irreducibility Criterion.
- 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.31. Prove statement of Theorem : for all integers and .Find all monic irreducible polynomials of degree 2 over Z3.