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Homework Statement
I have the metric ##ds^2 = -X^2dT^2 + dX^2##
Find the coordinate transformation that reduces the metric to that of flat spacetime:
##ds^2 = -dt^2 + dx^2##
Homework Equations
The Attempt at a Solution
I'm not sure there's a systematic way to solve this (or in general to show that a metric is just flat spacetime in a different coordinate system). And I've not been able to guess a suitable transformation.
Any advice or hints on a technique or an inspired guess?