Question
Find all the units of .
Answer :
Word Count : 207
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Skip in 10
Let ( \mathbb{Z}[\sqrt{-7}] = { a + b\sqrt{-7} \mid a, b \in \mathbb{Z} } ). An element ( u = a + b\sqrt{-7} ) is a unit if it has a multiplicative inverse in ( \mathbb{Z}[\sqrt{-7}] ), i.e., there exists ( v = c + d\sqrt{-7} \in \mathbb{Z}[\sqrt{-7}] ) such that [ u \cdot v =
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