User AndrewG

26 votes

3 answers

2k views

Evaluating the sum $\sum_{n=1}^{\infty} \frac{e - \left(1 + \frac{1}{n}\right)^n}{\sqrt{n}}$

asked Feb 16, 2013 at 18:29

20 votes

4 answers

3k views

Approximating continuous functions with polynomials

asked Jan 5, 2013 at 16:05

17 votes

2 answers

4k views

Minimal polynomial of product, sum, etc., of two algebraic numbers

asked Sep 16, 2015 at 15:12

14 votes

2 answers

7k views

Isomorphisms of inner-product spaces

asked Apr 5, 2013 at 7:08

12 votes

2 answers

3k views

p-adic numbers and group characters

asked Nov 27, 2013 at 18:59

9 votes

2 answers

2k views

Why are the phase portrait of the simple plane pendulum and a domain coloring of sin(z) so similar?

asked Oct 24, 2012 at 23:00

8 votes

2 answers

629 views

Klein's j-invariant and Ford circles

asked Nov 21, 2012 at 23:35

8 votes

1 answer

2k views

Is every complex number the root of a polynomial? (Converse to fundamental theorem of algebra.)

asked Oct 24, 2012 at 0:01

8 votes

3 answers

1k views

Fun but appropriate Christmas gift to give influential professors.

asked Dec 24, 2012 at 3:47

8 votes

1 answer

312 views

Geometric intuition behind the Hasse principle

asked Oct 28, 2013 at 20:54

7 votes

0 answers

217 views

(Co)homology in fluid dynamics

asked Oct 12, 2020 at 17:15

6 votes

2 answers

410 views

How many distinct translates of a (non-admissible) set $\mathcal{H}$ can consist entirely of primes?

asked Jun 6, 2013 at 19:50

6 votes

3 answers

513 views

$\int_{-\infty}^{\infty} \frac{\sin(x)}{x} dx $ with integration by parts?

asked Jan 28, 2013 at 5:59

4 votes

0 answers

798 views

Geometric intuition for Jordan normal forms (invariant subspaces, shearing, scaling, etc.)

asked Mar 19, 2013 at 12:11

4 votes

1 answer

160 views

Uniform convergence where speed of convergence varies with x?

asked Dec 23, 2012 at 22:53

4 votes

2 answers

421 views

An exercise in Silverman

asked Dec 5, 2013 at 9:08

4 votes

0 answers

731 views

The Heisenberg group over $\mathbb{Z}/2\mathbb{Z}$

asked Aug 25, 2014 at 9:15

2 votes

1 answer

5k views

Degrees of interpolating polynomials

asked Nov 22, 2013 at 18:30

1 vote

1 answer

462 views

Efficiency of the Sieve of Eratosthenes.

asked Jul 2, 2013 at 5:30

0 votes

1 answer

114 views

A generalization of perfect numbers

asked Jun 8, 2014 at 10:23

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20 Questions

Evaluating the sum $\sum_{n=1}^{\infty} \frac{e - \left(1 + \frac{1}{n}\right)^n}{\sqrt{n}}$

Approximating continuous functions with polynomials

Minimal polynomial of product, sum, etc., of two algebraic numbers

Isomorphisms of inner-product spaces

p-adic numbers and group characters

Why are the phase portrait of the simple plane pendulum and a domain coloring of sin(z) so similar?

Klein's j-invariant and Ford circles

Is every complex number the root of a polynomial? (Converse to fundamental theorem of algebra.)

Fun but appropriate Christmas gift to give influential professors.

Geometric intuition behind the Hasse principle

(Co)homology in fluid dynamics

How many distinct translates of a (non-admissible) set $\mathcal{H}$ can consist entirely of primes?

$\int_{-\infty}^{\infty} \frac{\sin(x)}{x} dx $ with integration by parts?

Geometric intuition for Jordan normal forms (invariant subspaces, shearing, scaling, etc.)

Uniform convergence where speed of convergence varies with x?

An exercise in Silverman

The Heisenberg group over $\mathbb{Z}/2\mathbb{Z}$

Degrees of interpolating polynomials

Efficiency of the Sieve of Eratosthenes.

A generalization of perfect numbers