Let I be an ideals of a ring R and S C R: (i) Show that InS is an ideal of S. Is it also an ideal of R? (ii) Either prove or give counterexample that every ideal of S is of the type InS for some ideal I of R. (iii) Show that if I n S homomorphism. {OR} then 7(S) = S, where T : R → R/I is the projection %3D

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Let I be an ideals of a ring R and SE R:
(i) Show that InS is an ideal of S. Is it also an ideal of R?
(ii) Either prove or give counterexample that every ideal of S is of the type INS for some
ideal I of R.
{OR} then 7(S) = S, where T : R → R/I is the projection
(iii) Show that if InS =
homomorphism.
Transcribed Image Text:Let I be an ideals of a ring R and SE R: (i) Show that InS is an ideal of S. Is it also an ideal of R? (ii) Either prove or give counterexample that every ideal of S is of the type INS for some ideal I of R. {OR} then 7(S) = S, where T : R → R/I is the projection (iii) Show that if InS = homomorphism.
Expert Solution
Step 1

I is an ideal of a ring R and S is subring of R.

So if xIS xI and xS

sxI     for some sS

and sxS

Hence, sxIS

Similarly xsIS

s[IS]=[IS]s=[IS]

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