So far i've proved that Ann(a) is a subring (under addition and multiplication), now to prove it's an ideal i've shown; say a1, a2 elements of R, then a1 - a2 element of R, now i need to show rK, Kr to be an element of R...how do I go about this?
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Originally Posted by pkr So far i've proved that Ann(a) is a subring (under addition and multiplication), now to prove it's an ideal i've shown; say a1, a2 elements of R, then a1 - a2 element of R, now i need to show rK, Kr to be an element of R...how do I go about this? If then . But then . Thus, .
Ah, my version was alot more long winded, thanks very much, sorry I can't add to your reputation, it says i have to give it to others! Many thanks.
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