Let K, I and J be ideals of ring R such that both I and J are subsets of K with I C J. Then show that K /l is subring of R/I and J /1 is an ideal of K/I. Moreover, show that (K/I)/0/!) = K/J. Can we deduce that (R/J)/(K/J) = R/K ?
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- Let I be an ideal in a ring R with unity. Prove that if I contains an element a that has a multiplicative inverse, then I=R.15. Prove that if is an ideal in a commutative ring with unity, then is an ideal in .Let I1 and I2 be ideals of the ring R. Prove that the set I1I2=a1b1+a1b2+...+anbnaiI1,biI2,nZ+ is an ideal of R. The ideal I1I2 is called the product of ideals I1 and I2.
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