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I'd like to know if there are any good online books, lecture notes, videos, tutorials, or similar that are free to the public (on differential equations). Suggestions are welcome!

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I have converted the question to community wiki, as it's asking for a big list and there is no single right answer. – Zev Chonoles Sep 7 '11 at 0:18
@Zev Chonoles: Thanks! – Matt Groff Sep 7 '11 at 0:22
@Matt: What's your background? Are you talking about ODE or PED, or both? More information may be helpful for people to answer you questions. – Jack Sep 7 '11 at 1:00
My background is computer science. I took a class on ODEs, but it's been awhile. I'd like to start with ODEs, but really anything is good at this point. – Matt Groff Sep 7 '11 at 1:35

Paul's online notes has a section on Differential equations:

I have not personally read them, but the rest of his notes are helpful and easy to read.

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well this one gives you a very huge collection to choose from

It requires you to be a registered member.

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well was that meant as sarcasm? anyhow, i have rephrased my words. if my previous answer seemed off the track, sry – Bhargav Sep 7 '11 at 4:04

You could try my notes, which include ode and pde. There are also applets on my web page.

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