Euclidean Domains and PIDS
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Show that the ring Z[i] = Z[x] / (x^2 + 1) is a Euclidean Domain, under N(n+mi) = n^2 + m^2. Then, conclude that Z[i] is a Principal Ideal Domain.
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Solution Summary
This solution discusses Euclidean domains and principal ideal domains. Step by step calculations are provided.
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Problem: Show that the ring Z[i] = Z[x] / (x^2 + 1) is a Euclidean Domain, under N(n+mi) = n^2 + m^2. Then, conclude that Z[i] is a Principal Ideal Domain.
Solution:
See two attachments for full workings of the solution.
Consider the multiples of a Gaussian integer z=k+mi. We have
(k+mi)(l+ni)=(kl-mn)+(kn+lm)i (1)
Let us consider the following particular cases:
l=1. In that case the right-hand ...
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