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[SOLVED] Quotient ring of Gaussian integers

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[SOLVED] If $G/Z(G)$ is cyclic, then $G$ is abelian

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[SOLVED] Normal subgroup of prime index

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[SOLVED] Units and Nilpotents

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[SOLVED] Group of even order contains an element of order 2

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[SOLVED] $|G|>2$ implies $G$ has non trivial automorphism

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[SOLVED] Comaximal ideals in a commutative ring

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[SOLVED] Why $\gcd(qb+r,b)=\gcd(b,r)$?

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[SOLVED] Characterizing units in polynomial rings

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[SOLVED] Similar matrices and field extensions

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[SOLVED] Why is $\mathbb{Z}[\sqrt{-n}], n\ge 3$ not a UFD?

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[SOLVED] The Center of $\operatorname{GL}(n,k)$

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[SOLVED] An Introduction to Tensors

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[SOLVED] For what $n$ is $U_n$ cyclic?

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[SOLVED] Is $\mathbb{Q}(\sqrt{2}) \cong \mathbb{Q}(\sqrt{3})$?