Organizer - Badge - Mathematics Stack Exchange

Organizer

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Awarded 8439 times.

cardinal exponentiation, $k^{<\lambda}$

Awarded Sep 2, 2010 at 18:44

Arturo Magidin

416k59 gold badges857 silver badges1.2k bronze badges

Why doesn't $0$ being a prime ideal in $\mathbb Z$ imply that $0$ is a prime number?

Awarded Aug 31, 2010 at 15:53

Bill Dubuque

281k41 gold badges332 silver badges1k bronze badges

(PQ)²=RSP, where P,Q,R,S are distinct single digit natural numbers, then R=?

Awarded Aug 26, 2010 at 18:31

whuber

8,7401 gold badge31 silver badges42 bronze badges

What are some real-world uses of Octonions?

Awarded Aug 23, 2010 at 15:20

damiano

1,96612 silver badges10 bronze badges

If $a \mid m$ and $(a + 1) \mid m$, prove $a(a + 1) | m$.

Awarded Aug 23, 2010 at 14:00

Pete L. Clark

100k11 gold badges233 silver badges377 bronze badges

Solving very large matrices in "pieces"

Awarded Aug 20, 2010 at 14:14

J. M. ain't a mathematician

76.5k8 gold badges218 silver badges346 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 19, 2010 at 13:34

Aryabhata

83.7k11 gold badges190 silver badges277 bronze badges

Assuming $P \neq NP$, do we know whether there are problems which are in $NP$, not in $P$ and are not $NP$ complete?

Awarded Aug 14, 2010 at 7:40

falagar

4,27023 silver badges26 bronze badges

Invariant Subspaces (Hardy Space)

Awarded Aug 13, 2010 at 9:25

Rasmus

18.9k3 gold badges72 silver badges103 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 12, 2010 at 0:24

ShreevatsaR

42.2k8 gold badges98 silver badges137 bronze badges

What are some real-world uses of Octonions?

Awarded Aug 11, 2010 at 20:54

Greg Graviton

5,3643 gold badges27 silver badges38 bronze badges

(post deleted or otherwise unavailable)

Awarded Aug 9, 2010 at 9:19

Pratik Deoghare

13.8k6 gold badges33 silver badges45 bronze badges

How to calculate reflected light angle?

Awarded Aug 8, 2010 at 15:04

kennytm

7,7235 gold badges39 silver badges37 bronze badges

Center of mass of an $n$-hemisphere

Awarded Aug 6, 2010 at 16:07

Noldorin

6,7886 gold badges35 silver badges40 bronze badges

Prove that $f(x) = \log_2 (1 - x) + x + x^2 + x^4 + x^8 + $ is bounded for $x\in [0,1)$

Awarded Aug 3, 2010 at 22:50

T..

11.8k2 gold badges41 silver badges52 bronze badges

Mathematical subjects you wish you learned earlier [closed]

Awarded Jul 31, 2010 at 16:44

Akhil Mathew

32.2k7 gold badges101 silver badges147 bronze badges

(post deleted or otherwise unavailable)

Awarded Jul 30, 2010 at 22:19

Chao Xu

5,9785 gold badges38 silver badges50 bronze badges

(post deleted or otherwise unavailable)

Awarded Jul 29, 2010 at 16:39

Mariano Suárez-Álvarez

139k12 gold badges257 silver badges389 bronze badges

Why should one expect valuations to be related to primes? How to treat an infinite place algebraically?

Awarded Jul 29, 2010 at 7:39

Qiaochu Yuan

464k54 gold badges1k silver badges1.5k bronze badges

Intuitive explanation of covariant, contravariant and Lie derivatives

Awarded Jul 29, 2010 at 0:14

Eric O. Korman

19.8k3 gold badges58 silver badges95 bronze badges

Proof that the irrational numbers are uncountable

Awarded Jul 27, 2010 at 5:43

Grigory M

18k4 gold badges90 silver badges135 bronze badges

Is the $24$ game NP-complete?

Awarded Jul 24, 2010 at 12:13

Tomer Vromen

1,9031 gold badge18 silver badges22 bronze badges

Is there a closed-form equation for $n!$? If not, why not?

Awarded Jul 23, 2010 at 18:53

Isaac

37k15 gold badges111 silver badges142 bronze badges

What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?

Awarded Jul 23, 2010 at 18:28

John Gietzen

3,6014 gold badges28 silver badges26 bronze badges

Can there be two distinct, continuous functions that are equal at all rationals?

Awarded Jul 22, 2010 at 17:23

Simon Nickerson

5,7913 gold badges26 silver badges29 bronze badges

If all sets were finite, how could the real numbers be defined?

Awarded Jul 22, 2010 at 16:13

mau

10.2k3 gold badges43 silver badges78 bronze badges

Simple explanation of a monad

Awarded Jul 21, 2010 at 23:53

BBischof

5,9572 gold badges40 silver badges48 bronze badges

Simple numerical methods for calculating the digits of $\pi$

Awarded Jul 21, 2010 at 16:53

Noah Snyder

10.2k5 gold badges43 silver badges62 bronze badges

Books on Number Theory for Layman

Awarded Jul 21, 2010 at 15:48

François G. Dorais

5,63336 silver badges40 bronze badges

Is it true that $0.999999999\ldots=1$? [closed]

Awarded Jul 21, 2010 at 10:53

Charles Stewart

4,6972 gold badges31 silver badges32 bronze badges

Online resources for learning Mathematics [closed]

Awarded Jul 21, 2010 at 10:48

Steve Bosman

1017 bronze badges

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

Awarded Jul 21, 2010 at 7:03

Edan Maor

2,0183 gold badges19 silver badges21 bronze badges

Why does the series $\sum_{n=1}^\infty\frac1n$ not converge?

Awarded Jul 21, 2010 at 5:28

Tom Stephens

6633 gold badges16 silver badges25 bronze badges

What are some good ways to get children excited about math?

Awarded Jul 20, 2010 at 23:22

Casebash

9,4279 gold badges58 silver badges85 bronze badges

Is it true that $0.999999999\ldots=1$? [closed]

Awarded Jul 20, 2010 at 20:27

badp

1,2661 gold badge17 silver badges30 bronze badges

What is an Inner Product Space?

Awarded Jul 20, 2010 at 20:17

Jamie Banks

13.4k7 gold badges38 silver badges39 bronze badges

How can you prove that the square root of two is irrational?

Awarded Jul 20, 2010 at 20:02

Larry Wang

9,7938 gold badges44 silver badges44 bronze badges

What is a real number (also rational, decimal, integer, natural, cardinal, ordinal...)?

Awarded Jul 20, 2010 at 20:02

Justin L.

15.1k22 gold badges66 silver badges75 bronze badges

(post deleted or otherwise unavailable)

Awarded Jul 20, 2010 at 19:37

JonnyLitt

6836 silver badges10 bronze badges

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