List questions from ring-theory

Published on 27 Apr 2026 - 2:43

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How many units in ring $\mathbb{Z}_{2^n}$?

Published on 12 Apr 2026 - 23:13

140

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How do I translate functions on the Prufer 2-group between functions on the $2^n$ roots of unity and the dyadic fractions modulo 1?

Published on 07 May 2026 - 8:43

236

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Why does the product in a group ring have finite support?

Published on 29 Apr 2026 - 12:50

270

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Embedding from Rational Numbers to Ordered Field is Order Preserving

Published on 07 May 2026 - 8:40

84

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Extension and restriction of involutions

Published on 29 Apr 2026 - 12:44

408

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Every locally closed irreducible subset $Z$ of $X:=\text{Spec}A$ contains a unique generic point.

Published on 05 May 2026 - 0:05

376

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How many elements does the quotient ring have?

Published on 12 Apr 2026 - 23:12

446

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Can a ring have multiple zero elements?

Published on 29 Apr 2026 - 12:16

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$\mathbb{Z}[i] / (2+3i)$ has 13 elements

Published on 04 May 2026 - 14:19

102

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Does a ring homomorphism necessarily induce a map of their spectrums?

Published on 08 Apr 2026 - 19:25

1.3k

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Prove that the only ring homomorphism is the trivial one

Published on 16 Apr 2026 - 13:19

244

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Exercise on conditions for a ring to be normal

Published on 02 May 2026 - 23:46

828

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All maximal subfields of a Division Algebra are isomorphic.

Published on 05 May 2026 - 4:08

93

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Integrality and ring morphisms $f:R\to S$

Published on 03 May 2026 - 11:11

List Question

Primary decomposition in a finite algebra

How many units in ring $\mathbb{Z}_{2^n}$?

How do I translate functions on the Prufer 2-group between functions on the $2^n$ roots of unity and the dyadic fractions modulo 1?

Why does the product in a group ring have finite support?

Embedding from Rational Numbers to Ordered Field is Order Preserving

Extension and restriction of involutions

Every locally closed irreducible subset $Z$ of $X:=\text{Spec}A$ contains a unique generic point.

How many elements does the quotient ring have?

Can a ring have multiple zero elements?

$\mathbb{Z}[i] / (2+3i)$ has 13 elements

Does a ring homomorphism necessarily induce a map of their spectrums?

Prove that the only ring homomorphism is the trivial one

Exercise on conditions for a ring to be normal

All maximal subfields of a Division Algebra are isomorphic.

Integrality and ring morphisms $f:R\to S$

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