### What’s hot at mathoverflow 23/2017

The two ways Feynman diagrams appear in mathematics

SPP 2026 - Geometry at Infinity

The two ways Feynman diagrams appear in mathematics

Concepts in topology successfully transferred to graph theory and combinatorics with non-trivial applications?

Why is the definition of higher homotopy groups the “right one”? Why is there no symplectic version of spectral geometry? Pullback and homology Is this generalization of Borsuk-Ulam true? Roots of unity Vandermonde matrix is totally positive Why are free objects “free”? Does there exist any non-contractible manifold with fixed point property?

Is there a geometric interpretation for Reidemeister torsion?

Open subsets of Euclidean space in dimension 5 and higher admitting exotic smooth structures

3D Billiards problem inside a torus

Finite-order self-homeomorphisms of \({\mathbb R}^n\)

Intuition for symplectic groups

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