# Ideals of Rings

Printable View

• Apr 5th 2009, 12:05 PM
Coda202
Ideals of Rings
let R be a commutative ring and fix a in R. Show that I_a = {x in R | ax=0} is an ideal of R.
• Apr 5th 2009, 12:41 PM
clic-clac
Hi
Do you know the definition of an ideal? Which part can't you prove (additive subgroup, closed under multiplication) ?
Don't forget $R$ commutativity.