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Self-Learner

Answer your own question with score of 3 or more.

Awarded 4594 times.

Primitive integer solutions to $2x^2+xy+3y^2=z^3$?

Awarded Jan 25, 2011 at 23:02

simplequestions

6834 silver badges11 bronze badges

Does having a codimension-1 embedding of a closed manifold $M^n \subset \mathbb{R}^{n+1}$ require $M$ to be orientable?

Awarded Jan 22, 2011 at 20:36

Aaron Mazel-Gee

8,3493 gold badges45 silver badges63 bronze badges

(post deleted or otherwise unavailable)

Awarded Jan 3, 2011 at 15:50

Yasir Arsanukayev

1651 gold badge1 silver badge10 bronze badges

Equivalent statements of the Axiom of Choice

Awarded Jan 1, 2011 at 7:23

yunone

23k10 gold badges85 silver badges161 bronze badges

Injective functions with intermediate-value property are continuous. Better proof?

Awarded Dec 30, 2010 at 8:53

Jyotirmoy Bhattacharya

5,8275 gold badges35 silver badges53 bronze badges

Do infinity and zero really exist?

Awarded Dec 28, 2010 at 13:28

Michel Gokan Khan

6911 gold badge8 silver badges20 bronze badges

Motivating infinite series

Awarded Dec 20, 2010 at 18:52

Mike Spivey

57k18 gold badges188 silver badges287 bronze badges

Braid Group, B_4->> S_4 onto, do I know kernel is P_4, pure braid group?

Awarded Dec 16, 2010 at 0:03

Andrew Marshall

5032 silver badges8 bronze badges

How to solve this rational equation for y

Awarded Dec 12, 2010 at 1:58

friedo

2,8635 gold badges25 silver badges19 bronze badges

Smooth functions for which $f(x)$ is rational if and only if $x$ is rational

Awarded Dec 11, 2010 at 4:38

J. J.

9,56625 silver badges49 bronze badges

Different ways to prove $\sum_{k=1}^\infty \frac{1}{k^2}=\frac{\pi^2}{6}$ (the Basel problem)

Awarded Dec 3, 2010 at 2:56

AD - Stop Putin -

11.2k8 gold badges44 silver badges74 bronze badges

Interesting results easily achieved using complex numbers

Awarded Dec 2, 2010 at 1:11

Adrián Barquero

15.6k3 gold badges61 silver badges108 bronze badges

Counting Lattice Points with Ehrhart Polynomials

Awarded Nov 24, 2010 at 4:36

user02138

17.4k5 gold badges61 silver badges90 bronze badges

Given $a_{1}=1, \ a_{n+1}=a_{n}+\frac{1}{a_{n}}$, find $\lim \limits_{n\to\infty}\frac{a_{n}}{n}$

Awarded Nov 14, 2010 at 15:44

daniel.jackson

2,4111 gold badge23 silver badges38 bronze badges

A real function question

Awarded Nov 14, 2010 at 4:14

TCL

14.7k6 gold badges35 silver badges83 bronze badges

What is the probability that every pair of students studies together at some point?

Awarded Oct 31, 2010 at 22:20

Larry Denenberg

7213 silver badges10 bronze badges

Decomposing the plane into intervals

Awarded Oct 27, 2010 at 4:57

Ross Millikan

384k28 gold badges266 silver badges475 bronze badges

Problem with binomial coefficients

Awarded Oct 23, 2010 at 22:27

svenwltr

1736 bronze badges

Local homeomorphism and coverings

Awarded Oct 15, 2010 at 0:10

Down

5154 silver badges12 bronze badges

Why is this coin-flipping probability problem unsolved?

Awarded Oct 7, 2010 at 14:22

Joseph O'Rourke

31.2k4 gold badges85 silver badges173 bronze badges

Aunt and Uncle's fuel oil tank dip stick problem

Awarded Sep 16, 2010 at 20:34

cobaltduck

1,4839 silver badges17 bronze badges

Why are the only numbers $m$ for which $n^{m+1}\equiv n \pmod{m}$ is true also unique for $\displaystyle\sum_{n=1}^{m}{n^m}\equiv 1 \bmod m$?

Awarded Sep 4, 2010 at 22:30

Eugene Bulkin

1,8471 gold badge21 silver badges34 bronze badges

When does the product of two polynomials = $x^{k}$?

Awarded Aug 29, 2010 at 0:12

Mykie

7,2755 gold badges42 silver badges62 bronze badges

Why does Benford's Law (or Zipf's Law) hold?

Awarded Aug 13, 2010 at 11:30

mau

10.2k3 gold badges45 silver badges80 bronze badges

How do Lagrange multipliers work to find the lowest value of a function subject to a constraint?

Awarded Aug 11, 2010 at 4:39

Tom Stephens

6833 gold badges16 silver badges25 bronze badges

Degree sequence of a graph has repeated entries

Awarded Aug 11, 2010 at 4:14

gprime

5933 gold badges7 silver badges17 bronze badges

a proof on the upperbound of this expression:

Awarded Aug 8, 2010 at 19:04

Manan

337 bronze badges

Nonprimes with $3^{n-1} \equiv 2^{n-1} \pmod n$

Awarded Aug 2, 2010 at 16:30

falagar

4,30024 silver badges26 bronze badges

Fermat's Two Square Theorem: How do you prove that an odd prime is the sum of two squares iff it is congruent to 1 mod 4?

Awarded Jul 31, 2010 at 16:44

Akhil Mathew

32.5k7 gold badges104 silver badges147 bronze badges

Intuitive understanding of the derivatives of $\sin x$ and $\cos x$

Awarded Jul 29, 2010 at 15:29

Justin L.

15.2k22 gold badges67 silver badges75 bronze badges

Best Maths Books for Non-Mathematicians

Awarded Jul 29, 2010 at 11:39

Edan Maor

2,0283 gold badges19 silver badges21 bronze badges

Mandelbrot-like sets for functions other than $f(z)=z^2+c$?

Awarded Jul 29, 2010 at 6:54

Isaac

37.1k15 gold badges112 silver badges142 bronze badges

What's an intuitive way to think about the determinant?

Awarded Jul 25, 2010 at 3:28

Jamie Banks

13.5k7 gold badges39 silver badges39 bronze badges

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

Awarded Jul 21, 2010 at 6:38

AgCl

6,5828 gold badges43 silver badges41 bronze badges

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