Co maximal ideals :
Two ideals A and B of R are said to be co-maximal if A+ B =RCentre of a ring :
Let R be a ring then its center denoted by Z (R ) and is defined as Z (R) { rÎR:xr = rx right all xÎR }
Right annihilator of an element :
Let R be a ring and a
ÎR
be any element. Then, right annihilator of ‘a’ is denoted by r (a ) , and is
defined as r(a) ={ rÎR:ar =0 In words , we can say that right annihilator
of ‘a’ is the collection of all those elements of ring which when multiplied
with ‘a’ on the right hand side gives zero.
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