The mathematical field of Differential Geometry turns out to provide the ideal mathematical framework for General Relativity. Here we look at some of the basic concepts, in particular the idea of a "metric tensor."
Note: To keep these videos "bite sized" I stopped this one before the part where an "appendix video" would be needed. We'll have those for the next vid.
Relativity playlist: http://www.youtube.com/playlist?list=PLF56602BAC693237E
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Playlist videos for General Theory of Relativity: