page1619 Rings Matthias Lorentzen...mattegrisenforlag.com
Look at the picture beneath, then
scroll down to the question and click the correct Answer button.
Question
Let `phi: ZZ_12 to ZZ_12` such that `phi(a)` = 6a mod 12. The image of all the odd numbers in `ZZ_12` is equal to 6. Is it true that `ker(phi)` is equal to the set of even numbers {0 , 2 , 4 , 6 , 8 , 10} ?
