... a, b, and < /b> d be positive integers. Prove that if (a, b) =1andddivides a, then (d, b) =1.10. Let a and < /b> b be positive integers. Prove that (a, b) =a if and < /b> only if adivides b. 11. Let a, b, c be ... (a0,a1, ,an) and < /b> (b 0 ,b 1, ,b n)inS such that the numbers a0,a1, ,anare rel-atively prime integers, the numbers b 0 ,b 1, ,b nare relatively primeintegers, and< /b> [(x0,x1, ,xn)]=[(a0,a1, ... difference setA B = {a b : a ∈ A, b ∈ B} ,the product setAB = {ab : a ∈ A, b ∈ B} , and < /b> the dilationd ∗A = {d}A = {da : a ∈ A}.The sets A and < /b> B eventually coincide, denoted by A ∼ B, if there existsan...