User user1337

115 votes

13 answers

22k views

Why, intuitively, is the order reversed when taking the transpose of the product?

asked May 13, 2015 at 6:35

46 votes

5 answers

4k views

Why do we negate the imaginary part when conjugating?

asked Mar 26, 2013 at 21:06

25 votes

1 answer

1k views

A conformal mapping onto a region bounded by convex contours (Ahlfors)

asked Nov 3, 2013 at 22:44

22 votes

4 answers

1k views

Prove that the boy cannot escape the teacher

asked Dec 2, 2015 at 2:40

20 votes

1 answer

348 views

A "relative" of the exponential function

asked Jul 17, 2017 at 12:08

20 votes

2 answers

10k views

The Schwarz Reflection Principle for a circle

asked Jul 22, 2013 at 18:27

20 votes

2 answers

9k views

How to build a smooth "transition function" explicitly?

asked Mar 12, 2013 at 22:10

16 votes

2 answers

6k views

Is my solution correct? subgroups and quotients of solvable groups are solvable

asked Jun 3, 2014 at 6:37

15 votes

4 answers

5k views

When are two direct products of groups isomorphic?

asked Jan 28, 2015 at 3:23

15 votes

3 answers

1k views

Show that $K=K'$ if and only if $k=(\sqrt{2}-1)^2$ (Ahlfors) [duplicate]

asked Oct 13, 2013 at 22:46

14 votes

3 answers

3k views

When does a multivariate power series define an entire function?

asked Sep 3, 2017 at 12:02

12 votes

3 answers

7k views

The family of analytic functions with positive real part is normal

asked Sep 16, 2013 at 22:39

12 votes

2 answers

3k views

Classifying groups of order 60

asked Jan 27, 2015 at 2:25

11 votes

1 answer

423 views

Generalizing Archimedes' "The Quadrature of the Parabola"

asked Aug 19, 2019 at 12:52

10 votes

1 answer

393 views

Summation Formula for Tangent/Secant Numbers

asked Apr 14, 2019 at 1:21

10 votes

1 answer

543 views

Largest symmetric group contained in alternating group

asked Jun 16, 2014 at 14:09

10 votes

1 answer

4k views

Is my proof correct? (Conformal equivalence of two circular annuli)

asked Nov 1, 2013 at 2:36

9 votes

1 answer

611 views

Is it possible for a Jordan curve in the plane to enclose a set with area zero?

asked Mar 10, 2013 at 19:40

9 votes

1 answer

3k views

Riemann-Stieltjes integrability criterion

asked Apr 2, 2013 at 21:13

9 votes

0 answers

1k views

The number of orbits of a (normal) subgroup

asked Jun 28, 2014 at 10:29

9 votes

1 answer

5k views

Any even elliptic function can be written in terms of the Weierstrass $\wp$ function

asked Nov 16, 2013 at 17:30

9 votes

1 answer

841 views

Where does Klein's j-invariant take the values 0 and 1, and with what multiplicities?

asked Nov 30, 2013 at 19:18

9 votes

3 answers

8k views

The group of rigid motions of the cube is isomorphic to $S_4$.

asked Apr 13, 2014 at 7:40

9 votes

0 answers

2k views

Any non-trivial finitely-generated group admits maximal subgroups

asked May 3, 2014 at 13:37

8 votes

3 answers

325 views

Is there any way to save this "proof" that $\aleph_0=\aleph$? [closed]

asked Jun 17, 2013 at 19:17

8 votes

2 answers

2k views

Baby Rudin, chapter 10, problem 1 - independence of order in multiple integrals.

asked Feb 26, 2013 at 23:33

8 votes

1 answer

666 views

Parameterizations of the unit simplex in $\mathbb{R}^3$

asked Jul 24, 2018 at 15:01

8 votes

1 answer

289 views

Solutions of $x^p+y^q=y^r+z^p=z^q+x^r$

asked Nov 15, 2015 at 2:14

7 votes

0 answers

195 views

Finding a particular solution to a linear PDE

asked Dec 17, 2018 at 16:21

7 votes

0 answers

67 views

Convergence of a Generalized Taylor Expansion

asked Feb 8, 2021 at 5:02

Stack Exchange Network

242 Questions

Why, intuitively, is the order reversed when taking the transpose of the product?

Why do we negate the imaginary part when conjugating?

A conformal mapping onto a region bounded by convex contours (Ahlfors)

Prove that the boy cannot escape the teacher

A "relative" of the exponential function

The Schwarz Reflection Principle for a circle

How to build a smooth "transition function" explicitly?

Is my solution correct? subgroups and quotients of solvable groups are solvable

When are two direct products of groups isomorphic?

Show that $K=K'$ if and only if $k=(\sqrt{2}-1)^2$ (Ahlfors) [duplicate]

When does a multivariate power series define an entire function?

The family of analytic functions with positive real part is normal

Classifying groups of order 60

Generalizing Archimedes' "The Quadrature of the Parabola"

Summation Formula for Tangent/Secant Numbers

Largest symmetric group contained in alternating group

Is my proof correct? (Conformal equivalence of two circular annuli)

Is it possible for a Jordan curve in the plane to enclose a set with area zero?

Riemann-Stieltjes integrability criterion

The number of orbits of a (normal) subgroup

Any even elliptic function can be written in terms of the Weierstrass $\wp$ function

Where does Klein's j-invariant take the values 0 and 1, and with what multiplicities?

The group of rigid motions of the cube is isomorphic to $S_4$.

Any non-trivial finitely-generated group admits maximal subgroups

Is there any way to save this "proof" that $\aleph_0=\aleph$? [closed]

Baby Rudin, chapter 10, problem 1 - independence of order in multiple integrals.

Parameterizations of the unit simplex in $\mathbb{R}^3$

Solutions of $x^p+y^q=y^r+z^p=z^q+x^r$

Finding a particular solution to a linear PDE

Convergence of a Generalized Taylor Expansion