Lecture 21, 18.376, Thu Apr 27, 2023.
Summary
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Continue review of the Stationary Phase method
Cover the "Stationary phase and the far field approximation"
Section 3 in the "Lecture Topics" notes posted on the web page.
   Finish "3.1 Large time for a 1-D scalar equation".
   Start  "3.2 Stationary Phase".
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