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abstract algebra - Ideals of the quadratic integer ring $\mathbb{Z}[\sqrt{-5}]$ - Mathematics Stack Exchange
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abstract algebra - In the ring of integers of $\mathbb Q[\sqrt d]$, if every non-zero ideal $A$ is a lattice, then is every ideal generated by at most two elements? - Mathematics
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There is Exactly One Ring Homomorphism From the Ring of Integers to Any Ring | Problems in Mathematics
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PDF] Cyclotomic matrices and graphs over the ring of integers of some imaginary quadratic fields | Semantic Scholar
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