Prove that if (R,+, ·) and (R',+', ') are isomorphic integral domains, then their ficlds of quoticnts are also isomorphic.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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16. Prove that if (R,+, ) and (R', -+', ') are isomorphic integral domains, then their
fields of quotients are also isomorphic.
17. From Problem 8(h), deduce that every field (F,-t,) has a unique prime subfield.
Is this result still true if (F,+,) is assumed merely to be a division ring?
18. Establish the following assertion, thereby completing the proof of Theorem 3-28:
Il (F,+,) is a field of characteristic zero and (K,+,) the prime subficld generated
by the identity clement, then (Q,+, ) (K,+,) via the mapping f(n/m) =
(nl) · (ml)-', whcre n, m E Z, m + 0.
19. Use the preceding problein to prove that any finile field (i.c., a field with a finite
number of elements) has nonzero characteristic.
Transcribed Image Text:16. Prove that if (R,+, ) and (R', -+', ') are isomorphic integral domains, then their fields of quotients are also isomorphic. 17. From Problem 8(h), deduce that every field (F,-t,) has a unique prime subfield. Is this result still true if (F,+,) is assumed merely to be a division ring? 18. Establish the following assertion, thereby completing the proof of Theorem 3-28: Il (F,+,) is a field of characteristic zero and (K,+,) the prime subficld generated by the identity clement, then (Q,+, ) (K,+,) via the mapping f(n/m) = (nl) · (ml)-', whcre n, m E Z, m + 0. 19. Use the preceding problein to prove that any finile field (i.c., a field with a finite number of elements) has nonzero characteristic.
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