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  • To be cont'd
106 votes
27 answers
58k views

Open problems with monetary rewards

96 votes
21 answers
13k views

Proofs of the uncountability of the reals

29 votes
11 answers
14k views

Is there any geometry where the triangle inequality fails?

21 votes
3 answers
2k views

Is this 1974 claim still valid?

16 votes
4 answers
9k views

Prime/undecomposable matrices

14 votes
1 answer
974 views

Transcendental numbers: yet another classification

9 votes
7 answers
5k views

Can we have A={A} ?

8 votes
1 answer
509 views

A partial converse to Bertrand's Postulate

7 votes
5 answers
2k views

The unprecedented success of the “intersection” operator

6 votes
4 answers
11k views

Non-isomorphic graphs of given order.

6 votes
1 answer
864 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
588 views

The minimal Goldbach basis

3 votes
3 answers
2k views

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

2 votes
1 answer
759 views

Ethio Integers?

2 votes
1 answer
7k views

Websites hosting free math ebooks. [duplicate]

2 votes
2 answers
797 views

From power series to differential equations

0 votes
2 answers
279 views

The X-series (for groups)

0 votes
2 answers
2k views

Transcription of a panel discussion about G.Perelman

-1 votes
1 answer
736 views

Taming this Conway-type sequence

-1 votes
1 answer
679 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]

-3 votes
2 answers
5k views

Factorizing polynomials of several variables (in a different perespective)