18.306 Lecture 13 - Thu 2021 04 08 - Virtual
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Recall "augmented" theory in #026:
  Add shocks to prevent characteristics from crossing;
  Rankine-Hugoniot conditions and Lax Entropy.  Students: please read #026!
Examples:
#027 Rarefaction fans. Do at least one example.
#028 Red light turns green; look at what happens if we introduce a "shock"
     [which violates entropy!].
#029 Why entropy condition is needed.
#030 Done in prior lecture. Students: please review!
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