(d) Show that 1 + √2 is a unit in R and use this to conclude that R has infinitely many units. (e) Determine if 3 - √2 and 5+ 4√2 are associate in R.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Let R = Z[√2] = {a+b√2: a, b € Z} and F = Q[√2] = {a+b√2: a,b ≤ Q}.
Then R is a ring, F is a field, and RC FCR.
Define the norm on F by setting v(a+b√2) = |a² − 2b21. Note that for a = a +b√2,
v(a) = |aa| where a = a - b√2
Transcribed Image Text:Let R = Z[√2] = {a+b√2: a, b € Z} and F = Q[√2] = {a+b√2: a,b ≤ Q}. Then R is a ring, F is a field, and RC FCR. Define the norm on F by setting v(a+b√2) = |a² − 2b21. Note that for a = a +b√2, v(a) = |aa| where a = a - b√2
(d) Show that 1 + √2 is a unit in R and use this to conclude that R has infinitely
many units.
(e) Determine if 3 − √2 and 5 + 4√√/2 are associate in R.
Transcribed Image Text:(d) Show that 1 + √2 is a unit in R and use this to conclude that R has infinitely many units. (e) Determine if 3 − √2 and 5 + 4√√/2 are associate in R.
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