User BenjaLim - Mathematics Stack Exchange

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	16,694 reputation	bio	website		visits	member for	9 months
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57

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Proving that a subset $\mathscr{H}$ is dense in $\mathbb{R}$

analysis

1d ago Peter Tamaroff 25.3k

2

11

votes

5

answers

945

views

Perfect set without rationals

real-analysis general-topology

may 5 at 19:39 Andres Caicedo 24.4k

4

2

votes

1

answer

88

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Problem related to a bounded analytic function defined on $ \{z \in \Bbb C: |z| \le 1\}$

complex-analysis

may 5 at 17:18 Thomas 206

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votes

1

answer

291

views

Two Disjoint Compact sets

metric-spaces compactness

may 1 at 16:13 user1620696 2,274

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13

votes

2

answers

542

views

No continuous function switches $\mathbb{Q}$ and the irrationals

general-topology

apr 21 at 3:18 leo 2,685

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3

votes

1

answer

759

views

When do Sylow subgroups have trivial intersection?

abstract-algebra

apr 17 at 22:31 julien 22.4k

2

5

votes

4

answers

835

views

Simplest Example of a Poset that is not a Lattice

elementary-set-theory order-theory lattice-orders

apr 13 at 20:51 yihenew 1

4

15

votes

4

answers

1

kviews

Matrices which are both unitary and Hermitian

linear-algebra matrices

apr 10 at 7:17 J. M. 38.9k

1

3

votes

2

answers

82

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Why is $X^4 + \overline{2}$ irreducible in $\mathbb{F}_{125}[X]$?

field-theory finite-fields extension-field irreducible-polynomials

apr 7 at 9:34 Pete L. Clark 44.4k

3

5

votes

2

answers

621

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What does “extend linearly” mean in linear algebra?

linear-algebra

apr 5 at 16:42 Jack 7,491

2

1

vote

1

answer

112

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Homogenous localization and normal localization in graded modules

abstract-algebra commutative-algebra

mar 20 at 5:44 Community♦ 1

1

7

votes

1

answer

114

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On an exercise from Hartshorne's Algebraic Geometry

algebraic-geometry

mar 19 at 17:25 QiL'8 15.3k

32

28

votes

5

answers

3

kviews

An Introduction to Tensors

tensors

mar 17 at 11:19 dibyajyoti kakoti 1

2

4

votes

2

answers

205

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How do you show that $\mathbb{Z}[x]/(x^2-29) \cong \{a+b\sqrt{29}|a,b \in \mathbb{Z}\}$?

abstract-algebra ring-theory

mar 15 at 2:19 Brandon Carter 4,491

7

9

votes

5

answers

695

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A non-noetherian ring with $\text{Spec}(R)$ noetherian

commutative-algebra

mar 11 at 23:41 Junyan Xu 56

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9

answers

3

kviews

A really complicated calculus book

calculus reference-request differential-geometry algebraic-topology

feb 26 at 11:48 Dave Hartman 548

4

12

votes

2

answers

160

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Galois Group of the Hilbert Class Field

algebraic-number-theory class-field-theory

feb 16 at 8:50 Dominic Michaelis 11.8k

8

12

votes

4

answers

244

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Irreducibility of Polynomials in $k[x,y]$

algebraic-geometry commutative-algebra

feb 14 at 17:19 Hurkyl 21.5k

33

36

votes

19

answers

3

kviews

Mathematical subjects you wish you learned earlier

soft-question learning

feb 13 at 23:19 andyvn22 101

1

vote

3

answers

96

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The relation between been the quotient ring of a prime ideal and its localization

algebraic-geometry commutative-algebra schemes motivation

feb 12 at 21:37 YACP 8,960

2

3

votes

2

answers

76

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Application of Hilbert 90 for Finite Fields

galois-theory finite-fields

feb 7 at 18:35 Jyrki Lahtonen 30.6k

4

5

votes

3

answers

879

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Are all extensions of finite fields cyclic?

abstract-algebra

feb 7 at 17:23 Community♦ 1

1

3

votes

1

answer

291

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Bijective hom sets

abstract-algebra

feb 2 at 7:06 Community♦ 1

1

2

votes

2

answers

129

views

How to show an Algebraic Number Field is the Field of Fractions of its Ring of Integers

number-theory

jan 31 at 21:24 Andrew 1,643

12

19

votes

5

answers

797

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Does $G\cong G/H$ imply that $H$ is trivial?

group-theory

jan 31 at 11:23 user1729 3,339

5

8

votes

2

answers

513

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Methods to check if an ideal of a polynomial ring is prime or at least radical

commutative-algebra polynomials ring-theory ideals

jan 25 at 22:42 YACP 8,960

5

9

votes

1

answer

1

kviews

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

abstract-algebra ring-theory

jan 24 at 0:01 YACP 8,960

1

3

votes

2

answers

223

views

Homotopy Question Help?

general-topology algebraic-topology differential-topology geometric-topology

jan 23 at 22:14 fritz 49

1

vote

1

answer

137

views

Difference between two statements about Galois theory

abstract-algebra field-theory galois-theory

jan 22 at 4:55 JSchlather 9,705

2

4

votes

2

answers

233

views

Why aren't there any coproducts in the category of $\bf{Fields}$?

field-theory category-theory

jan 20 at 15:29 MJD 20.7k

BenjaLim

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