User Unknown

106 votes

27 answers

58k views

Open problems with monetary rewards

asked May 26, 2011 at 18:01

96 votes

21 answers

13k views

Proofs of the uncountability of the reals

asked Nov 22, 2010 at 17:19

29 votes

11 answers

14k views

Is there any geometry where the triangle inequality fails?

asked Apr 30, 2010 at 14:37

21 votes

3 answers

2k views

Is this 1974 claim still valid?

asked Feb 4, 2011 at 17:12

16 votes

4 answers

9k views

Prime/undecomposable matrices

asked May 27, 2010 at 8:23

14 votes

1 answer

974 views

Transcendental numbers: yet another classification

asked Mar 29, 2011 at 14:29

9 votes

7 answers

5k views

Can we have A={A} ?

asked Jul 25, 2010 at 15:11

8 votes

1 answer

509 views

A partial converse to Bertrand's Postulate

asked Mar 13, 2011 at 10:58

7 votes

5 answers

2k views

The unprecedented success of the “intersection” operator

asked Jul 26, 2010 at 7:48

6 votes

4 answers

11k views

Non-isomorphic graphs of given order.

asked Jun 26, 2010 at 9:14

6 votes

1 answer

864 views

Reconstruction Conjecture: Group theoretic formulation

asked Aug 8, 2010 at 11:20

4 votes

1 answer

2k views

Isomorphism and number of subgroups

asked Sep 4, 2010 at 16:58

4 votes

4 answers

1k views

Less-known conjectures of significant influence and the contrary

asked Jun 5, 2010 at 6:43

4 votes

5 answers

4k views

Fundamental theorems [closed]

asked May 20, 2010 at 8:25

4 votes

1 answer

2k views

Unsolved problems concerning Artinian Rings and Artinian Modules

asked Mar 30, 2011 at 12:13

4 votes

1 answer

588 views

The minimal Goldbach basis

asked Feb 7, 2011 at 23:21

3 votes

3 answers

2k views

'Sign matrices'-(-1,+1) square matrices

asked Sep 29, 2010 at 8:40

2 votes

1 answer

759 views

Ethio Integers?

asked Jun 12, 2010 at 9:59

2 votes

1 answer

7k views

Websites hosting free math ebooks. [duplicate]

asked Jun 4, 2010 at 12:43

2 votes

2 answers

797 views

From power series to differential equations

asked Dec 26, 2010 at 13:38

0 votes

2 answers

279 views

The X-series (for groups)

asked Feb 9, 2011 at 17:49

0 votes

2 answers

2k views

Transcription of a panel discussion about G.Perelman

asked Aug 7, 2010 at 10:22

-1 votes

1 answer

736 views

Taming this Conway-type sequence

asked Aug 8, 2010 at 12:59

-1 votes

1 answer

679 views

List of sites related to the Riemann Hypothesis and recent developments?

asked May 15, 2010 at 14:49

-2 votes

1 answer

1k views

Unpopular "elementary" theorems/identities to impress an audience of mathematicians. [closed]

asked Jan 3, 2011 at 13:31

-3 votes

1 answer

2k views

Are there infinitely many equivalence classes of similar matrices? [closed]

asked Apr 29, 2010 at 19:51

-3 votes

2 answers

5k views

Factorizing polynomials of several variables (in a different perespective)

asked Jun 10, 2010 at 7:28

Stack Exchange Network

27 Questions

Open problems with monetary rewards

Proofs of the uncountability of the reals

Is there any geometry where the triangle inequality fails?

Is this 1974 claim still valid?

Prime/undecomposable matrices

Transcendental numbers: yet another classification

Can we have A={A} ?

A partial converse to Bertrand's Postulate

The unprecedented success of the “intersection” operator

Non-isomorphic graphs of given order.

Reconstruction Conjecture: Group theoretic formulation

Isomorphism and number of subgroups

Less-known conjectures of significant influence and the contrary

Fundamental theorems [closed]

Unsolved problems concerning Artinian Rings and Artinian Modules

The minimal Goldbach basis

'Sign matrices'-(-1,+1) square matrices

Ethio Integers?

Websites hosting free math ebooks. [duplicate]

From power series to differential equations

The X-series (for groups)

Transcription of a panel discussion about G.Perelman

Taming this Conway-type sequence

List of sites related to the Riemann Hypothesis and recent developments?

Unpopular "elementary" theorems/identities to impress an audience of mathematicians. [closed]

Are there infinitely many equivalence classes of similar matrices? [closed]

Factorizing polynomials of several variables (in a different perespective)