# 2.10 A spacetime orbifold in two dimensions, 3

A First Course in String Theory

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(b) Draw a spacetime diagram, indicate the $\displaystyle{x^+}$ and $\displaystyle{x^-}$ axes, and sketch the family of curves

$\displaystyle{x^+ x^- = a^2}$,

where $\displaystyle{a > 0}$ is a real constant that labels the various curves.

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— Me@2021-08-31 08:42:40 PM

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