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We recently had a question in the relativity forums that mentioned the behavior of magnetic field lines and reminded me of my confusion at school about what magnetic field lines were. You see a lot of diagrams showing the field around a magnet that looks like this: [Image source – author: Geek3, GNU Free Documentation…
A few months ago, pervect pointed me to a post by Chris Hillman which is an introduction to the usage of Maxima for General Relativity. Maxima is a free (both as in beer and as in speech) symbolic algebra package, and it includes a library called censor that handles tensor components and looks to have…