[Bagemihl 1951]: Let ℒ be the set of straight lines in ℝ². Given any function f: ℒ → {2, 3, 4, ...} , there is a subset X ⊆ ℝ² such that for every line L ∈ ℒ we have | X ⋂ L | = f(L) .

How does the Russo-Ukrainian War end? on Thinking about... snyder.substack.com/p/how-does-the…

Classical polylogarithms and Bernoulli polynomials satisfy the same set of distribution relations. I wonder why.

In order of difficulty: - Manifolds of negative curvature, - Manifolds of zero curvature, - Manifolds of positive curvature, - Independent journalism in Russia.

Department of the Russian Literature at the Kyiv National University after a missile strike earlier today. A powerful metaphor for the Putin's Russian World project. Via Перзидент Роисси