A useful Macro (in Mathematica) to compute curvature tensors in General Relativity is the one by Sotirios Bonanos, can be found here.
A useful visualization of de Sitter/Anti-de Sitter spacetimes is here.
I was part of the National phase for Physics Olympiad (Senigallia, Italy) in 2004 and 2005; Part of 2005 National phase of Chemistry Olympiad (Frascati). Here you can find a comprehensive set of exercises in preparation to these competitions
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