User Taxi Driver - Mathematics Stack Exchange

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	7,218 reputation	bio	website		visits	member for	1 year, 3 months
1627 badges		location	Brazil		seen	16 hours ago

137

188

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kviews

How to study math to really understand it and have a healthy lifestyle with free time?

soft-question advice

dec 31 at 5:24 Grigor 1

19

64

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3

answers

1

kviews

What remains in student's mind

soft-question education

jun 28 at 22:19 Michael Hardy 47.9k

20

34

votes

17

answers

3

kviews

What's the goal of mathematics?

soft-question philosophy

dec 26 '11 at 23:32 Andrew 1,643

7

28

votes

3

answers

827

views

If $e^A$ and $e^B$ commute, do $A$ and $B$ commute?

linear-algebra exponential-function

apr 3 at 21:46 Seirios 8,802

11

26

votes

6

answers

1

kviews

How many connected components does $\mathrm{GL}_n(\mathbb R)$ have?

general-topology matrices lie-groups

apr 18 at 6:08 Seirios 8,802

5

20

votes

2

answers

1

kviews

What is the image near the essential singularity of z sin(1/z)?

complex-analysis

jan 11 '11 at 9:37 Community♦ 1

7

19

votes

2

answers

1

kviews

Is there a continuous bijection from $\mathbb{R}$ to $\mathbb{R}^2$

homework general-topology

jun 30 '11 at 2:07 Aryabhata 47.5k

7

17

votes

3

answers

737

views

Research in algebraic topology

algebraic-topology soft-question

jul 15 at 20:55 Tyler Lawson 866

5

17

votes

2

answers

688

views

Does constant modulus on boundary of annulus imply constant function?

complex-analysis

jan 1 '12 at 16:26 Community♦ 1

7

17

votes

6

answers

1

kviews

Characterizing nonconstant entire functions with modulus 1 on the unit circle

complex-analysis

aug 9 at 9:08 Moritzplatz 351

6

15

votes

5

answers

298

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Is $e^x$ the only isomorphism between the groups $(\mathbb{R},+)$ and $(\mathbb{R}_{> 0},*)$?

group-theory

feb 13 at 22:21 usul 425

2

15

votes

2

answers

631

views

When is a local homeomorphism a covering map?

general-topology

nov 2 at 20:39 robjohn♦ 59.2k

8

14

votes

3

answers

1

kviews

on the boundary of analytic functions

complex-analysis

mar 6 '11 at 0:12 Jonas Meyer 34.9k

5

13

votes

3

answers

357

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Self Study in Dynamical Systems

reference-request dynamical-systems

apr 20 '12 at 19:18 Taxi Driver 7,218

4

12

votes

4

answers

307

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Can every nonsingular $n\times n$ matrix with real entries be made singular by changing exactly one entry?

linear-algebra matrices

apr 2 at 8:43 Marc van Leeuwen 23.7k

2

12

votes

5

answers

468

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Does there exist a matrix $\mathbf{A}\in\mathbb{R}^{3\times3}$ such that $\mathbf{A}^{2}=-\mathbf{I}$?

matrices

2d ago Landscape 7,690

5

11

votes

3

answers

297

views

What type of object is a differential form?

differential-geometry

aug 19 at 3:12 Matt E 57.6k

4

11

votes

1

answer

372

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holomorphic functions and fixed points

complex-analysis

jul 8 '11 at 1:29 Dylan Moreland 13.4k

4

10

votes

2

answers

447

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Entire functions such that $f(z^{2})=f(z)^{2}$

complex-analysis functional-equations

nov 29 '11 at 16:30 J. M. 38.9k

2

10

votes

2

answers

113

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$|f(x)-f(y)|\le(x-y)^2$ without gaplessness

real-analysis general-topology inequality metric-spaces

mar 19 at 19:23 zyx 10.9k

4

10

votes

1

answer

177

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Space of homeomorphisms Homeo$(S^1)$ of $S^1$ deformation retracts onto $O(2)$

general-topology geometric-topology

mar 7 at 7:27 Martin 3,688

4

10

votes

2

answers

685

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if $f$ is entire and $|f(z)| \leq 1+|z|^{1/2}$, why must $f$ be constant?

complex-analysis

oct 14 at 10:47 Norbert 19.9k

5

10

votes

4

answers

2

kviews

What is the 'implicit function theorem'?

real-analysis intuition multivariable-calculus

jul 6 at 10:13 DBr 786

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10

votes

1

answer

151

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Does $f(z+2\pi)=f(z)$ for all $z\in \mathbb{C}$?

complex-analysis

may 25 '12 at 22:29 Joel Cohen 3,669

4

9

votes

1

answer

81

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Homeomorphism between open unit ball and $\mathbb R^n$

real-analysis general-topology continuity

may 13 at 21:34 egreg 2,246

2

9

votes

5

answers

280

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$\varphi$ in $\operatorname{Hom}{(S^1, S^1)}$ are of the form $z^n$

abstract-algebra group-theory algebraic-topology representation-theory

nov 17 at 19:09 Matt N. 15.2k

2

9

votes

2

answers

116

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The existence of a group automorphism with some properties implies commutativity.

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

mar 29 at 4:51 Alexander Gruber 15.1k

2

9

votes

1

answer

673

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Proving the Maximum Modulus Principle using the Open Mapping Theorem

complex-analysis

jan 8 '12 at 20:35 Davide Giraudo 56.1k

3

9

votes

2

answers

442

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Proof that $\frac{1}{2\pi i}\oint f'(z)/f(z) \, dz = n$

complex-analysis

dec 12 '10 at 22:14 Daniel McLaury 1,580

2

9

votes

3

answers

422

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Is the reciprocal of an analytic function analytic?

real-analysis analysis complex-analysis

jun 1 '11 at 17:27 Joel Cohen 3,669

Taxi Driver

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