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Recent Posts
- Fundamental Symmetries in Krein Spaces 2026/07/31
- Polar Decomposition and Partial Isometries 2026/07/15
- Monotone convergence for bounded self-adjoint operators 2026/07/08
- Functoriality of the Borel Functional Calculus and Pushforward of Spectral Measures 2026/07/04
- Spectral integrals and a first taste of functional calculus 2026/07/03
- Spectral family and resolution of the identity 2026/06/25
- Square root lemma 2026/06/17
- Positive operators II 2026/06/11
- Positive operators I 2026/06/04
- Complexification of a Real Krein Space. Part I 2026/06/01
- Pre-Hilbert space – its Dual and Completion 2026/05/29
- Fundamental Symmetries in Minkowski Krein Space 2026/05/20
- Krein spaces – a quantum-theoretical monad method 2026/05/12
- Krein spaces – first steps 2026/05/09
- Counting infinities 2026/05/03
- Infinite geometry 2026/04/24
- Recovery 2026/03/22
- Exterior algebra 2026/01/18
- 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
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Category Archives: Geometry
Conformal structure – until the puppy grows up
On my other blog, I promised Anna—the ever‑curious Reader—that I would finally tackle the subject of conformal structure. So here it begins: a gentle introduction to a concept that admits many gateways. Precise definitions abound online, of course, and one … 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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Geodesics of left invariant metrics on matrix Lie groups – Part 2 Conservation laws
In the last post, Geodesics of left invariant metrics on matrix Lie groups – Part 1,we have derived Arnold’s equation – that is a half of the problem of finding geodesics on a Lie group endowed with left-invariant metric. Suppose … Continue reading
Posted in Euler's equations, Geometry
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