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A set of numbers used to quantify location in space.
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Difficult coordinate transformation
I am trying to introduce a tortoise coordinate for a modified Schwarzschild metric
$$\mathrm{d}s^2=\left(1-\frac{2M\mathop{}\!\mathrm{erf}(r)}{r}\right) \mathrm{d}t^2 + \left(1-\frac{2M\mathop{}\!\ma …