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 K=Q(i,sqrt(2)). a) Prove that K/Q is a Galois extension, and determine its Galois group. b) Determine with proof which of the following fields is a Galois extension of Q, i) K(sqrt(1+sqrt(2)), ii) K(sqrt(i+sqrt(2)), iii) K(sqrt(sqrt(2)+sqrt(-2)).

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Why the minimal polynomial x^2 - (sqrt(2)+sqrt(-2)) splits into linear factors over K?

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