It is a fact, which we can verify by cubing, that the zeros of x'- 2 in Q are -1+iv3 aj = V2, az = 21-iv3 a2 = and 2 where 2, as usual, is the real cube root of 2. Use this information in Exercises 4 through 4. Describe all extensions of the identity map of Q to an isomorphism mapping Q(2) onto a subfield of Q. 5. Describe all extensions of the identity map of Q to an isomorphism mapping Q(2, /3) onto a subfield of Q. 6. Describe all extensions of the automorphism 3-v3 of Q(/3) to an isomorphism mapping Q(i, 3, V2) onto a subfield of O.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Section 49 number 4,5,6
It is a fact, which we can verify by cubing, that the zeros of x- 2 in Q are
maidqiomomodgoitaulavo orb o1 gaibTogaoTIo
a3 = V21-iV3
where 2, as usual, is the real cube root of 2. Use this information in Exercises 4 through 6.
aj = V2.
and
4. Describe all extensions of the identity map of Q to an isomorphism mapping Q(/2) onto a subfield of Q.
5. Describe all extensions of the identity map of Q to an isomorphism mapping Q(2, /3) onto a subfield of Q.
6. Describe all extensions of the automorphism 5-/3 of Q(/3) to an isomorphism mapping Q(i, 3, V2)
onto a subfield of Q.
U (200
Transcribed Image Text:It is a fact, which we can verify by cubing, that the zeros of x- 2 in Q are maidqiomomodgoitaulavo orb o1 gaibTogaoTIo a3 = V21-iV3 where 2, as usual, is the real cube root of 2. Use this information in Exercises 4 through 6. aj = V2. and 4. Describe all extensions of the identity map of Q to an isomorphism mapping Q(/2) onto a subfield of Q. 5. Describe all extensions of the identity map of Q to an isomorphism mapping Q(2, /3) onto a subfield of Q. 6. Describe all extensions of the automorphism 5-/3 of Q(/3) to an isomorphism mapping Q(i, 3, V2) onto a subfield of Q. U (200
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