Ideal Let A and B be ideals of a ring R. Prove that (a) is an ideal of R (b) is an ideal of R 
Re: Ideal Check what happens if you multiply r (an arbitrary ring element) by an element of or an element of A+B. 
Re: Ideal Ok for part a) i need to show using and . Proof: let and , . How do i go form here to show that and ? 
Re: Ideal Quote:

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