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abs1
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prove that $2+8{\sqrt{-5}}$ is unit and irreducible or not in $\mathbb Z+\mathbb Z{\sqrt{-5}}$.
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abs said:prove that $2+8{\sqrt{-5}}$ is unit and irreducible or not in $\mathbb Z+\mathbb Z{\sqrt{-5}}$.
Klaas van Aarsen said:Hint: we can write $2+8{\sqrt{-5}}=2(1+4\sqrt{-5})$.
abs said:please explain in detail if possible
abs said:an element alpha belong to k ia called a unit if alpha divisible by 1.
abs said:dear it is my question if u not solved it then no problem its ok .if u solved it then give me complete explanation thank u so much
abs said:irreducible element:a non zero non unit element alpha belong to k is said to be irreducible if aplha=ab.
either a is unit or b is unit.
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