Entries by Ibix

Are Magnetic Field Lines Real?

We recently had a question in the relativity forums that mentioned the behavior of magnetic field lines, and reminded me of my own confusion at school about what magnetic field lines actually were. You see a lot of diagrams showing the field around a magnet that looking like this: [Image source – author: Geek3, GNU […]

Solving Einstein’s Field Equations in Maxima

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 ctensor that handles tensor components and looks to have […]