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 * '''Lecture 3''', ~-Oct 9-~: <<la(L03-Air-Resistance-and-Non-Linear-Oscillation.pdf, "Air resistance, Non-linear oscillator")>>
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 {{{#!wiki comment

 * <<color("Change:", tomato>> The end of page 4: references to sections and examplesa are remogved.&mdash;~-''<<DateTime(2014-10-07T12:15:16-0700)>>''-~
 * <<color("Correction:")>> Page 3: Marge box, near the end: last year &rarr; 2010.&mdash;~-''<<DateTime(2014-10-07T09:32:15-0700)>>''-~
 * <<color("Change:", tomato)>> The end of page 2: &ldquo;the textbook&rdquo; &rarr; &ldquo;various books.&rdquo;&mdash;~-''<<DateTime(2014-10-06T18:38:25-0700)>>''-~

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 * <<color("Correction")>> At the end, the case when $v_0$ is non-zero was discussed incorrectly when it was added in tha last change. Now, that discussion is corrected.&mdash;~-''<<DateTime(2014-10-05T09:25:14-0700)>>''-~  * <<color("Correction")>> At the end, the case when $v_0$ is non-zero was discussed incorrectly in the Oct 3 version. Now, corrected.&mdash;~-''<<DateTime(2014-10-05T09:25:14-0700)>>''-~

Lecture Notes

Appendices

  • A1: Perturbation

    • Correction At the end, the case when $v_0$ is non-zero was discussed incorrectly in the Oct 3 version. Now, corrected.—9:25AM, Oct 05, 2014

    • Addition: Page 8, more physics discussion added at the end.—10:28AM, Oct 03, 2014

    • Correction, addition: Page 7, the last term in the third order solution had a wrong sign—now corrected. Page 8, discussion added about the exact solution.—9:30PM, Oct 02, 2014

    • Change: page 6, the first sentence and the equations of the example (A.2) were arranged in a slightly different way.—12:42PM, Oct 02, 2014

  • A2: Essential trig identities