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109 votes
29 answers
62k views

Open problems with monetary rewards

101 votes
21 answers
15k views

Proofs of the uncountability of the reals

29 votes
11 answers
15k views

Is there any geometry where the triangle inequality fails?

21 votes
3 answers
2k views

Is this 1974 claim still valid?

17 votes
4 answers
10k views

Prime/undecomposable matrices

14 votes
1 answer
1k views

Transcendental numbers: yet another classification

11 votes
6 answers
5k views

Can we have A={A} ?

8 votes
1 answer
527 views

A partial converse to Bertrand's Postulate

7 votes
5 answers
2k views

The unprecedented success of the “intersection” operator

7 votes
4 answers
11k views

Non-isomorphic graphs of given order.

6 votes
1 answer
891 views

Reconstruction Conjecture: Group theoretic formulation

4 votes
1 answer
2k views

Isomorphism and number of subgroups

4 votes
4 answers
1k views

Less-known conjectures of significant influence and the contrary

4 votes
5 answers
4k views

Fundamental theorems [closed]

4 votes
1 answer
2k views

Unsolved problems concerning Artinian Rings and Artinian Modules

4 votes
1 answer
634 views

The minimal Goldbach basis

3 votes
3 answers
2k views

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

2 votes
1 answer
764 views

Ethio Integers?

2 votes
1 answer
7k views

Websites hosting free math ebooks. [duplicate]

2 votes
2 answers
821 views

From power series to differential equations

0 votes
2 answers
294 views

The X-series (for groups)

0 votes
2 answers
2k views

Transcription of a panel discussion about G.Perelman

-1 votes
1 answer
740 views

Taming this Conway-type sequence

-1 votes
1 answer
680 views

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

-2 votes
1 answer
1k views

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

-3 votes
1 answer
2k views

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

-4 votes
2 answers
5k views

Factorizing polynomials of several variables (in a different perespective)