Lecture 14, 18.300, Tue Mar 29, 2022.
Summary
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#043.5 Dimensional analysis, similarity solutions, etc.
 This point is relevant after the prior problem set [#4].
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Continue with diffusion effects in Traffic Flow:
#044, #045, #046, #047, #048, #049
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Note that #042 [information loss at shocks] is intimately related to
the topic here: When diffusion is small, we can neglect it EXCEPT at
at shocks. This diffusion causes the dissipation/loss of info. there
--- as shown in #049.
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USEFUL FOR #047 [this is a recap of something done earlier].
REVIEW "graphical theory" for \dot{y} = f(y). Phase line, and qualitative
       plot of solutions y = y(t). Behavior near critical points by
linearization. Inflection points. Etc. Exact solution by separation is
useless, unless f(y) is pretty simple [e.g.: 1st/2nd order polynomial].
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