17

Answers
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5
Combinatorial results without known combinatorial proofs
2
Origins of Mathematical Symbols/Names
5
Nice proof of the Jordan curve theorem?
4
What are the Applications of Hypergraphs
5
Which graphs have incidence matrices of full rank?
5
Generalizations of Planar Graphs
2
How many of the true sentences are provable?
6
coordinates of vertices of regular simplex
5
Combinatorial distance ≡ Euclidean distance
5
Chromatic number of graphs of tangent closed balls
11
Extremal question on matrices
3
Is the theory of incidence geometry complete?
6
Erdős–Stone theorem type edge density estimates for bipartite graphs?
10
Continuous automorphism groups of normed vector spaces?
18
How much choice is needed to show that formally real fields can be ordered?
5
Ordered geometries from convex subsets of the plane
8
Labelled spanning trees without edge crossings