Lecture 04, 18.376, Thu Feb 16, 2023.
Summary
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Finish point #008: Derive [B] and fix error in lecture: Need BOTH
[A] and [B] to get [C] --- [A] is not enough.
Then cover lecture points: #009; skip #010; sketch #011--#012. Start #013.
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NOTE: Here #nnn	are references to the Lecture Points file.
      [PSQ] means Problem Set Question.
 The "lecture summaries and points" are NOT intended as study materials.
 The points purpose is explained in the "lecture points" file.
 The summaries are brief descriptions each lecture, used by the instructor
 to keep track of the material covered. They ARE *NOT* "lecture notes" to
 be used to study and/or replace attending the lectures, etc. They are
 provided for your convenience, as a help to organize your own notes.
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