User hmmmm - Mathematics Stack Exchange

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	1,126 reputation	bio	website	none	visits	member for	1 year, 6 months
416 badges		location	United Kingdom		seen	7 mins ago

39

78

votes

31

answers

6

kviews

Can you provide me historical examples of pure mathematics becoming “useful”?

feb 26 at 16:22 KeithS 1,041

21

40

votes

13

answers

2

kviews

Pseudo Proofs that are intuitively reasonable

proof-strategy big-list

dec 8 at 21:02 Elias 2,848

33

32

votes

4

answers

3

kviews

Lesser-known integration tricks

calculus big-list integration

mar 25 '12 at 16:59 Linda Collins Sandgren 41

16

28

votes

2

answers

2

kviews

The square roots of the primes are linearly independent over the field of rationals

abstract-algebra prime-numbers field-theory

oct 7 at 23:05 Community♦ 1

16

23

votes

5

answers

1

kviews

Help understanding Algebraic Geometry

reference-request algebraic-geometry projective-geometry

jan 7 at 11:49 Stefan Hansen 8,518

10

23

votes

1

answer

546

views

How many primes does Euclid's proof account for?

number-theory prime-numbers asymptotics

apr 2 '12 at 17:20 Clive Newstead 15.3k

11

22

votes

4

answers

599

views

How should I approach taking math tests?

soft-question

jul 11 '11 at 7:14 Mathemagician1234 3,744

12

22

votes

3

answers

2

kviews

First-Order Logic vs. Second-Order Logic

logic set-theory

apr 7 '11 at 20:40 Community♦ 1

11

17

votes

2

answers

587

views

Applications of the Jordan-Hölder Theorem.

abstract-algebra group-theory reference-request modules

apr 10 at 8:43 azimut 5,468

7

15

votes

2

answers

606

views

Why is $\mathbb{Q}(t,\sqrt{t^3-t})$ not a purely transcendental extension of $\mathbb{Q}$?

abstract-algebra field-theory

sep 23 '10 at 18:00 Robin Chapman 14.3k

6

15

votes

4

answers

638

views

Mathematical statement with simplest independence proof

elementary-set-theory set-theory forcing

jul 20 at 17:31 Steven Stadnicki 14.2k

3

12

votes

2

answers

2

kviews

What happens if we remove the requirement that $\langle R, + \rangle$ is abelian from the definition of a ring?

abstract-algebra ring-theory terminology definition

dec 20 at 0:09 Alexander Gruber 15.1k

6

11

votes

2

answers

627

views

Nice application of the Cauchy?-Frobenius?-Burnside?-Pólya? formula

group-theory soft-question combinatorics

nov 10 at 0:28 Asaf Karagila 90.7k

4

10

votes

3

answers

602

views

Coloring the faces of a hypercube

geometry combinatorics abstract-algebra group-theory

sep 30 '10 at 18:04 Robin Chapman 14.3k

3

9

votes

2

answers

523

views

Is a Fourier transform a change of basis, or is it a linear transformation?

linear-algebra fourier-analysis transformation

mar 23 '12 at 12:21 leonbloy 12.1k

1

9

votes

1

answer

410

views

Choosing a Master Thesis Topic: Logic - Model Theory

logic soft-question model-theory advice

nov 17 at 21:42 Asaf Karagila 90.7k

3

9

votes

4

answers

1

kviews

Intuitive meaning of Limit Supremum?

real-analysis reference-request limit examples-counterexamples limsup

jan 4 '12 at 14:28 Martin Sleziak 20.3k

1

8

votes

2

answers

166

views

Why does $\omega$ have the same cardinality in every (transitive) model of ZF?

set-theory cardinals

nov 3 at 23:23 Asaf Karagila 90.7k

4

8

votes

2

answers

618

views

Probability that the convex hull of random points contains sphere's center

geometry geometric-probability

jan 17 at 21:46 joriki 92.5k

1

8

votes

3

answers

114

views

Cardinality of the Union is less than the cardinality of the Cartesian product

set-theory cardinals

nov 26 at 20:40 Michael Greinecker 12.4k

1

7

votes

1

answer

151

views

Isomorphism of rings implies isomorphism of vector spaces?

linear-algebra abstract-algebra commutative-algebra ring-theory vector-spaces

jan 3 at 12:48 Alexei Averchenko 2,666

2

6

votes

2

answers

339

views

Proving $V_{\kappa}$ is a model of ZFC for inaccessible $\kappa$

set-theory large-cardinals

jul 13 '11 at 21:37 Asaf Karagila 90.7k

1

6

votes

1

answer

254

views

Is the sentence “$(A,\in)\models ZFC$” absolute?

logic set-theory

feb 26 '11 at 15:13 JDH 18.5k

3

6

votes

1

answer

99

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Given a model of ZF where $ \mathbb{R} $ is the countable union of countable sets, does every subset of $ \mathbb{R} $ have measure zero?

measure-theory set-theory axiom-of-choice

nov 2 at 21:35 Haskell Curry 11.1k

3

6

votes

2

answers

402

views

Intuitive explanation of the Burnside Lemma

group-theory intuition

nov 19 '10 at 7:22 Dan Ramras 1,005

5

votes

4

answers

714

views

Finding the Units in the Ring $\mathbb{Z}[t][\sqrt{t^{2}-1}]$

number-theory abstract-algebra ring-theory

nov 23 '11 at 10:53 Andrea 2,980

1

5

votes

3

answers

335

views

How do the separation axioms follow from the replacement axioms?

elementary-set-theory

oct 5 at 17:56 Asaf Karagila 90.7k

1

5

votes

3

answers

181

views

$G$ group, $H \trianglelefteq G$, $\vert H \vert$ prime, Prove $H \leq Z(G)$,

abstract-algebra group-theory finite-groups abelian-groups

nov 4 at 21:58 Shubhodip Mondal 439

2

5

votes

1

answer

93

views

Ring Automorphisms and Roots of Monic Polynomials

abstract-algebra

nov 8 at 19:38 lhf 35.3k

1

5

votes

2

answers

210

views

What fragment of ZFC do we need to prove Zorn's lemma?

set-theory axiom-of-choice topos-theory

apr 20 at 14:48 Andreas Blass 7,038

hmmmm

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