(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] error in my book

1. The problem statement, all variables and given/known data

My book says that (Z cross Z)/<(1,2)> = Z. I say it equals Z cross Z_2. This is easy to see if you draw it out on a lattice plane. Right?

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Error in my book

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