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In a previous question by me I asked about Berger spheres and their Lorentzian analogue, squashed $AdS_3$ along Hopf fibres. It was well answered (by https://mathoverflow.net/users/13268/ben-mckay) ...

I was wondering if anyone could point me to a pdf copy of the following paper by Lionel Berard-Bergery: "Scalar curvature and isometry group", in Spectra of Riemannian Manifolds, Kaigai ...

I am looking for the article Charles W. Trigg, "Tetrahedron rolled onto a plane", J. Recreational Mathematics, 3(2):82–87, 1970. It is from @Joseph O'Rourke comment in the previous post "Die-rolling ...