18.306 Lecture 17 - Tue 2021 04 27 - Virtual
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#033b Characteristics as locus of weak singularities.
      Second order scalar equations.
#044  First order quasi-linear 1-D systems of equations.

Note:
SKIP #034--#038
#039--#040 ... already covered.
#041 Will be in a PSet.
#042-#043 Students should read.
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