User Vladimir - Mathematics Stack Exchange

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visits	member for	1 year, 7 months
	seen	May 16 at 0:57
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	471 reputation	bio	website		visits	member for	1 year, 7 months
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26

62

votes

7

answers

5

kviews

Tablet for reading textbooks and writing math by hand?

mar 28 at 16:04 hhh 1,502

19

44

votes

3

answers

11

kviews

What is the practical difference between a differential and a derivative?

calculus

mar 6 at 20:48 user65397 1

15

34

votes

6

answers

3

kviews

How do I convince someone that $1+1=2$ may not necessarily be true?

logic soft-question

nov 28 at 18:56 Dave L. Renfro 6,586

28

33

votes

5

answers

2

kviews

Getting better at proofs

soft-question proof-strategy

oct 28 '10 at 23:25 Qiaochu Yuan 117k

23

33

votes

4

answers

3

kviews

Is there a quick proof as to why the vector space of $\mathbb{R}$ over $\mathbb{Q}$ is infinite-dimensional?

linear-algebra

sep 26 '11 at 20:12 Leon Lampret 2,625

14

32

votes

5

answers

2

kviews

What does it take to get a job at a top 50 math program in the U.S.?

soft-question career-development

jan 4 '12 at 5:25 Pete L. Clark 44.3k

7

30

votes

6

answers

1

kviews

Why don't analysts do category theory?

analysis functional-analysis soft-question category-theory

jan 2 at 23:59 paul garrett 10.5k

5

22

votes

2

answers

416

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Is the Maclaurin series expansion of $\sin x$ related to the inclusion-exclusion principle?

calculus combinatorics trigonometry taylor-expansion inclusion-exclusion

jun 19 '12 at 4:30 Austin Mohr 11.5k

7

21

votes

2

answers

383

views

There are at most two prime numbers dividing $|G|$

group-theory finite-groups

sep 15 at 10:05 Nicky Hekster 2,677

6

20

votes

2

answers

570

views

Is the fundamental theorem of calculus independent of ZF?

calculus functional-analysis logic set-theory banach-spaces

aug 22 at 4:39 Alexander Shamov 1,416

2

20

votes

4

answers

1

kviews

What are the dangers of visual exposition of mathematics?

geometry soft-question learning

sep 17 at 14:33 Ronnie Brown 2,964

7

15

votes

3

answers

459

views

When does every group with order divisible by $n$ have a subgroup of order $n$?

abstract-algebra group-theory

feb 29 '12 at 11:22 Curufin 164

8

14

votes

3

answers

709

views

Not every metric is induced from a norm

functional-analysis metric-spaces

jul 13 at 12:08 BenjaLim 16.6k

4

14

votes

9

answers

539

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Coordinate-free proof of $\operatorname{Tr}(AB)=\operatorname{Tr}(BA)$?

linear-algebra matrices trace

apr 16 at 15:39 julien 22.3k

6

13

votes

4

answers

1

kviews

Proof by Contradiction, Circular Reasoning?

logic proof-strategy

feb 24 '12 at 16:36 Henning Makholm 53.5k

10

12

votes

5

answers

14

kviews

What is Jacobian Matrix?

calculus multivariable-calculus

may 13 at 15:55 Américo Tavares 20.5k

14

12

votes

5

answers

1

kviews

Methods to see if a polynomial is irreducible

abstract-algebra polynomials

may 4 '11 at 8:10 Bruno Stonek 3,133

4

11

votes

4

answers

347

views

Is this a dirac delta function?

integration mathematical-physics

mar 10 at 12:38 Fabian 10.7k

7

9

votes

5

answers

695

views

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

commutative-algebra

mar 11 at 23:41 Junyan Xu 56

1

6

votes

1

answer

143

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A Haar measure via the Lebesgue measure on $\Bbb R^d$

measure-theory

jul 19 at 9:55 robjohn♦ 59.1k

3

6

votes

3

answers

234

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Showing $\tau(n)/\phi(n)\to 0$ as $n\to \infty$

number-theory analytic-number-theory

dec 20 '11 at 21:53 Will Jagy 21.5k

4

6

votes

2

answers

263

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About frullani integral

real-analysis integral

dec 30 at 20:34 saz 5,397

5

6

votes

4

answers

503

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How many arrangements of $\{a,2b,3c,4d, 5e\}$ have no identical consecutive letters?

combinatorics permutations

oct 28 '11 at 18:57 leonbloy 12.1k

1

5

votes

1

answer

68

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Standard terminology for the relation between $A$ and $B$ if $B= Q^t A P$?

linear-algebra matrices terminology

aug 18 at 13:43 Filippo 396

1

4

votes

2

answers

271

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Some other ways to prove a partitions problem

combinatorics partitions

oct 25 '11 at 0:15 Brian M. Scott 153k

1

4

votes

1

answer

290

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Dual of $\ell_{\infty}$ is not $\ell_1$

homework sequences-and-series analysis functional-analysis

apr 27 '11 at 0:45 Qiaochu Yuan 117k

3

votes

4

answers

231

views

A proof that shows surjective homomorphic image of prime ideal is prime

commutative-algebra

feb 21 at 22:50 BenjaLim 16.6k

2

3

votes

2

answers

164

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Closure of the Laplacian in $L^2(\mathbb R^n)$

real-analysis functional-analysis

sep 11 '11 at 19:05 Nate Eldredge 22.3k

1

3

votes

1

answer

163

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What conditions can lead us to $\arctan(\tan x)=x$?

algebra-precalculus trigonometry

sep 20 at 19:10 Clive Newstead 15.2k

2

3

votes

1

answer

169

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On the asymptotic behavior of a function related to the number of distinct prime divisors

number-theory analytic-number-theory

dec 19 '11 at 6:09 Greg Martin 7,403

Vladimir

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