deletions | additions       diff --git a/paragraph_2_Mimic_the_derivation__.tex b/paragraph_2_Mimic_the_derivation__.tex  index 7e4820f..132dbf0 100644  --- a/paragraph_2_Mimic_the_derivation__.tex  +++ b/paragraph_2_Mimic_the_derivation__.tex 
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\\  $ \Omega^{-} {\Omega^{-}  \equiv {(x,t) : 0 < t < \infty, -\infty < x < \varepsilon(t)}$  \\$\Omega^{+} \varepsilon(t)}}$  \\$ {\Omega^{+}  \equiv {(x,t) : 0 < t < \infty, \varepsilon(t) < x <+\infty} $ }$