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Albert Einstein added Gaussian Coordinates.tex
almost 11 years ago
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\section{Gaussian Coordinates}
Two neighbouring points P and P' on the surface then correspond to the co-ordinates
$$
P: u, v
P': u + du, v + dv,
$$
where du and dv signify very small numbers. In a similar manner we may indicate the distance (line-interval) between P and P', as measured with a little rod, by means of the very small number ds. Then according to Gauss we have
