Question

A step is not clear in flatness of completion

score 72 · Answer 1 · 2026-04-12 04:15:55

72

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A step is not clear in flatness of completion

Published on 12 Apr 2026 - 4:15

score 41 · Answer 2 · 2026-04-13 01:35:10

41

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Homomorphism and modules

Published on 13 Apr 2026 - 1:35

score 61 · Answer 3 · 2026-04-15 14:13:15

61

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Isomorphism between homomorphism-sets

Published on 15 Apr 2026 - 14:13

score 5.3k · Answer 4 · 2026-04-12 13:17:24

5.3k

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Every nonempty subset of $\mathbb{N}$ has a smallest element.

Published on 12 Apr 2026 - 13:17

score 69 · Answer 5 · 2026-04-23 11:10:45

69

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Solving the equation $y^2=-1$ mod $5^{n+1}$

Published on 23 Apr 2026 - 11:10

score 2.3k · Answer 6 · 2026-05-10 16:13:22

2.3k

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One question regarding a subring of $Q$ which will contain 1.

Published on 10 May 2026 - 16:13

score 63 · Answer 7 · 2026-05-05 21:11:23

63

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$\mathbb{Z}_p[\mathbb{Z}/p^{n}\mathbb{Z}]\cong \mathbb{Z}_p[T]/\left((T+1)^{p^n}-1\right)$ as topological rings?

Published on 05 May 2026 - 21:11

score 952 · Answer 8 · 2026-04-08 21:03:52

952

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Relating the trace and norm in Galois theory with the trace and determinant of a certain matrix

Published on 08 Apr 2026 - 21:03

score 1.2k · Answer 9 · 2026-04-13 15:12:42

1.2k

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R is semisimple if and only if every R module is projective

Published on 13 Apr 2026 - 15:12

score 267 · Answer 10 · 2026-05-11 02:06:35

267

Views

Prove that for the ring of dual numbers over $K$: $K[\epsilon]$, have $K[\epsilon]^{\times}\cong K^{\times}\times K^+$

Published on 11 May 2026 - 2:06

score 69 · Answer 11 · 2026-04-13 23:39:39

69

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Which group theory books could teach me how to determine the set of nonisomorphic groups of a given order?

Published on 13 Apr 2026 - 23:39

score 979 · Answer 12 · 2026-04-16 12:10:54

Prove that any linear combination of the functions $e^x$ and $e^{-x}$ (for example:$ f(x)=ae^x + be^{-x}$) can be written as $d \cosh(x-x_o)$

score 155 · Answer 13 · 2026-05-10 18:28:58

155

Views

Looking for a reference for this proof of radical ideals being finite intersections of prime ideals

Published on 10 May 2026 - 18:28

score 107 · Answer 14 · 2026-04-11 06:38:28

107

Views

Calculate eigenvalues and eigenvectors of linear map

Published on 11 Apr 2026 - 6:38

score 116 · Answer 15 · 2026-04-13 21:40:19

116

Views

Fixed Fields of Subgroups of a Galois Group

Published on 13 Apr 2026 - 21:40

List Question

A step is not clear in flatness of completion

Homomorphism and modules

Isomorphism between homomorphism-sets

Every nonempty subset of $\mathbb{N}$ has a smallest element.

Solving the equation $y^2=-1$ mod $5^{n+1}$

One question regarding a subring of $Q$ which will contain 1.

$\mathbb{Z}_p[\mathbb{Z}/p^{n}\mathbb{Z}]\cong \mathbb{Z}_p[T]/\left((T+1)^{p^n}-1\right)$ as topological rings?

Relating the trace and norm in Galois theory with the trace and determinant of a certain matrix

R is semisimple if and only if every R module is projective

Prove that for the ring of dual numbers over $K$: $K[\epsilon]$, have $K[\epsilon]^{\times}\cong K^{\times}\times K^+$

Which group theory books could teach me how to determine the set of nonisomorphic groups of a given order?

Prove that any linear combination of the functions $e^x$ and $e^{-x}$ (for example:$ f(x)=ae^x + be^{-x}$) can be written as $d \cosh(x-x_o)$

Looking for a reference for this proof of radical ideals being finite intersections of prime ideals

Calculate eigenvalues and eigenvectors of linear map

Fixed Fields of Subgroups of a Galois Group

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