Let c be in a ring R and let I = {rc | r is in R} Give an example to show that if R is not a commutative ring, then I need not be an ideal. Can someone help me this?
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Originally Posted by anlys Let c be in a ring R and let I = {rc | r is in R} Give an example to show that if R is not a commutative ring, then I need not be an ideal. For any and any , . But may not be in .
Originally Posted by Byun For any and any , . But may not be in . Hello Byun, Thanks for your input. Do you also have a particular example to show this?
Originally Posted by anlys Let c be in a ring R and let I = {rc | r is in R} Give an example to show that if R is not a commutative ring, then I need not be an ideal. Can someone help me this? we have: let then
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