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Notes on traveling waves and the wave equation - A powerpoint file gives a presentation on traveling waves and the wave equation. A Mathematica notebook shows you how to make movies of traveling waves and I included a QuckTime movie as well.

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This Mathematica notebook (beats.nb) shows you how to play beats: First you hear a pure 440 Hz then a mixture of 440 Hz + 441 Hz.

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Partial Derivatives: see this

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Useful Weblinks: chain rule and examples