To be fair, one never talks of relativistic "velocities" beyond undergrad physic... | Hacker News

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ssivark on July 20, 2018 | parent | context | favorite | on: The Octonion Math That Could Underpin Physics

To be fair, one never talks of relativistic "velocities" beyond undergrad physics. It is much easier to talk about Lorentz "boosts", and as members of a Lie Group, they are associative, though not commutative.

throwaway37585 on July 20, 2018 [–]

This. It's better to just make the full leap into spacetime geometry (4-vectors and 4-tensors) than keep trying to slice it into annoying 3-vectors.

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