Definition:Cyclotomic Ring

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Definition

Let $\Z \sqbrk {i \sqrt n}$ be the set $\set {a + i b \sqrt n: a, b \in \Z}$.


The algebraic structure $\struct {\Z \sqbrk {i \sqrt n}, +, \times}$ is the $n$th cyclotomic ring.



Examples

$5$th Cyclotomic Ring

The $5$th cyclotomic ring is the algebraic structure:

$\struct {\Z \sqbrk {i \sqrt 5}, +, \times}$

where $\Z \sqbrk {i \sqrt 5}$ is the set $\set {a + i b \sqrt 5: a, b \in \Z}$.

$\struct {\Z \sqbrk {i \sqrt 5}, +, \times}$ is a ring.


Also see

  • Results about cyclotomic rings can be found here.