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Let a EC Z such that a? EZ and Rea=0. Let N: Z[0] → Z:2H |212. (a) Show that N() NU {0} for all ze Z[a], and that if ry in Za], then N (2) N(y). (b) Show that Z[a] satisfies the ascending chain condition for principal ideals. (e) (Bonus) Show that Z[iV2 is a Euclidean domain. (Hint: there's a proof in the textbook that Z[i] is a Euclidean domain that you can modify.) (d) Show that Ziv5) is not...
Let a EC Z such that a? EZ and Rea=0. Let N: Z[0] → Z:2H |212. (a) Show that N() NU {0} for all ze Z[a], and that if ry in Za], then N (2) N(y). (b) Show that Z[a] satisfies the ascending chain condition for principal ideals. (e) (Bonus) Show that Z[iV2 is a Euclidean domain. (Hint: there's a proof in the textbook that Z[i] is a Euclidean domain that you can modify.) (d) Show that Ziv5) is not...
Let R={1 € Q[2] : [0) € Z}. (a) Show that R is an integral domain and R* = {+1}. (b) Show that irreducibles of Rare Ep for primes pe Z, and S() ER with (0 €{+1} which are irreducible in Q[r]. (c) Show that r is not a product of irreducibles, and hence R does not satisfy the ascending chain condition for principal ideals.
Please do exercise 129: Exercise 128: Define r:N + N by r(n) = next(next(n)). Let f:N → N be the unique function that satisfies f(0) = 2 and f(next(n)) =r(f(n)) for all n E N. 102 1. Prove that f(3) = 8. 2. Prove that 2 <f(n) for all n E N. Exercise 129: Define r and f as in Exercise 128. Assume that x + y. Define r' = {(x,y),(y,x)}. Let g:N + {x,y} be the unique function that...