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Recent Posts
- Kronecker generalized deltas and Levi-Civita epsilons 2026/01/09
- It’s all about permutations 2025/12/28
- Densities 2025/12/21
- Tensors on a picnic 2025/12/14
- Tensors are geometric objects 2025/12/10
- Conformal structure – until the puppy grows up 2025/12/07
- Growing Out of the Sandbox 2025/12/02
- Blog reincarnation with analytic idealism 2025/11/30
- Minkowski patches in the Einstein universe 2025/11/27
- Floating in the Einstein Universe 2025/11/24
- Comments on Clifford algebras 2019/01/24
- Comment on “Could ordinary quantum mechanics be just fine for all practical purposes?” by Alexey Nikulov 2018/03/08
- Spinning Top – Space Odity 2017/05/28
- Geodesics of left invariant metrics on matrix Lie groups – Part 2 Conservation laws 2017/05/26
- Geodesics of left invariant metrics on matrix Lie groups – Part 1 2017/05/24
- Killing vectors, geodesics, and Noether’s theorem 2017/05/23
- SL2R as anti de Sitter space cont. 2017/05/15
- Becoming anti de Sitter 2017/05/14
- SL(2,R) Killing vector fields in coordinates 2017/05/11
- Riemannian metrics – left, right and bi-invariant 2017/05/09
- Riemannian metric on SL(2,R)- explicit formula 2017/05/08
- Riemannian metric on SL(2,R) 2017/05/07
- Parametrization of SL(2,R) 2017/05/06
- Curvature of the upper half-plane 2017/05/05
- Geodesics on upper half-plane factory direct 2017/05/04
- Einstein the Stubborn 2017/05/03
- Dedekind tessellation on the Poincaré disk 2017/05/02
- Dedekind tessellation or circles all the way down 2017/04/30
- Real magic – space-time in Lie algebra 2017/04/29
- Geodesics on the upper half-plane – parametrization 2017/04/28
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Open System – Ark's blog
Monthly Archives: November 2025
Blog reincarnation with analytic idealism
I am reincarnating my old blog. It is a kind of rebirth. And, in Bernardo Kastrup’s analytic idealism, a newborn is not a tabula rasa. Kastrup does not see reincarnation as a literal soul moving into a new body. Instead, … Continue reading
Posted in Philosophy
Tagged analytic idealism, Bernatdo Kastrup, Carlo Rovelli, reincarnation
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Minkowski patches in the Einstein universe
This post is a continuation of Floating in the Einstein Universe. Let us recall the relevant definition from the previous post. . So is the union of all light rays through p. For we have only two light … Continue reading
Floating in the Einstein Universe
This post is the third chapter of the “Primer” saga, based on “A primer on the (2 + 1) Einstein universe” – a paper is written by five mathematicians, T. Barbot, V. Charette, T. Drumm, M. Goldmann, K. Melnick, … Continue reading
Posted in Compactified Minkowski space, Geometry
Tagged Einstein Universe, null cones, photons, projectivization
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