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Recent Posts
- Tensors 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
- Geodesics on the upper half-plane – Part 2 circles 2017/04/27
- Geodesics on the upper half-plane – Part 1 Killing vectors 2017/04/26
- Conformally Euclidean geometry of the upper half-plane 2017/04/25
- Esher’s Limit Circle IV rendered on the complex upper half-plane 2017/04/24
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Category Archives: Spin matrices
When China Rules the World
The title of the post can be found on Wikipedia with additional information. But this post is more personal. Indeed China rulez! Few weeks ago I received the following email: Quantum World-2017 Time: 16th-18th October, 2017 Place: Changsha, Hunan Province, … Continue reading
Pauli, rotations and quaternions
In Nobody understands quantum mechanics, but spin is fun we met three Pauli matrices . They are kinda OK, but they are not quite fitting our purpose. Therefore I will replace them with another set of matrices, and I will … Continue reading
Posted in Quaternions, Spin and rotations, Spin matrices
8 Comments
Nobody understands quantum mechanics, but spin is fun
Let me start with a quote from Richard Feynman, “The Character of Physical Law“, The M.I.T. Press 1985, p. 129: … There was a time when the newspapers said that only twelve men understood the theory of relativity. I do … Continue reading
Posted in Spin and rotations, Spin matrices
5 Comments
