Let a be an algebraic integer in Q(v-37) and let A = (2, 1 + v-37). Prove that either a or a –- 1 is in A.
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- Find the smallest integer in the given set. { and for some in } { and for some in }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.Assume the statement from Exercise 30 in section 2.1 that for all and in . Use this assumption and mathematical induction to prove that for all positive integers and arbitrary integers .
- Let a be an integer. Prove that 3|a(a+1)(a+2). (Hint: Consider three cases.)True or false Label each of the following statement as either true or false. Let and be integers, not both zero, such thatfor integers and. Then .True or false Label each of the following statement as either true or false. Let and be integers, not both zero, such that. Then there exist integers andsuch that and .
- 30. Prove statement of Theorem : for all integers .Let and be positive integers. If and is the least common multiple of and , prove that . Note that it follows that the least common multiple of two positive relatively prime integers is their product.Let be as described in the proof of Theorem. Give a specific example of a positive element of .