14

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24

What recent discoveries have amateur mathematicians made?

9

What is the oldest open problem in mathematics ?

1

Combinatorial results without known combinatorial proofs

1

Basic results with three or more hypotheses

8

Who is Kirszbraun?

5

Properties of a non-sofic group

3

Theory of cones

1

Functional calculus for direct integrals

4

Construction of a maximal ideal

1

Decomposition of a dynamical system into ergodic componenents

1

expected number of overlapping edges from k cycles in a graph

4

Integer vectors in the kernel of an integer matrix

2

Graph properties: definability and decidability

4

Extending a bi-invariant metric from a set of generators to the whole group.