general question

What kind of systems implement these constructs.

http://mathworld.wolfram.com/RiemannTensor.html
http://www.hit.ac.il/jse/B/inpress/vaish.pdf
http://arxiv.org/ftp/gr-qc/papers/0511/0511086.pdf

http://en.wikipedia.org/wiki/Cartan_formalism_(physics)
http://qedcorp.com/APS/GPStetrads.pdf

http://www.math.washington.edu/~gunt...leprlfinal.pdf

http://arxiv.org/abs/0812.5107

http://scholar.google.ca/scholar?hl=en&q=warp-drive
http://arxiv.org/find/all/1/all:+AND.../0/1/0/all/0/1

http://scholar.google.ca/scholar?q=t...wormhole&hl=en
http://arxiv.org/find/all/1/all:+AND.../0/1/0/all/0/1

http://scholar.google.ca/scholar?q=s...pacetime&hl=en
http://scholar.google.ca/scholar?hl=...rved+spacetime

http://scholar.google.ca/scholar?hl=...ors+warp+drive
http://scholar.google.ca/scholar?hl=...sable+wormhole