
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Transcribed Image Text:Thomas W. Hungerford - Abstrac x
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numbers is a subring of M(R).
10. Let R and S be rings and consider these subsets of R X S:
R= {(r, Os) |rER} and S= {(OR, s) | SES}.
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(a) If R= Z3 and S = Zs. What are the sets R and S?
(b) For any rings Rand S, show that Ris a subring of RX S.
Goun at
(c) For any rings R and S, show that S is a subring of RX S.
11. Let R be a ring and ma fixed integer. Let S = {rɛR|mr =
is a subring of R.
OR}. Prove that S
12. Let a and b be elements of a ring R.
(a) Prove that the equation a + x = b has a unique solution in R. (You
must prove that there is a solution and that this solution is the only
one.)
(b) If R is a ring with identity and a is a unit, prove that the equation ax = b
has a unique solution in R.
13. Let Sand T be subrings of a ring R. In (a) and (b), if the answer is "yes,"
prove it. If the answer is “no," give a counterexample.
(a) Is Sn Ta subring of R?
(b) Is SU Ta subring of R?
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