I need help with Diffusion on the Whole Line.(adsbygoogle = window.adsbygoogle || []).push({});

For instance, my first homework problem is:

Solve the diffusion equation Ut = Uxx with the initial value conditions phi(x) = 1 for |x| > l, phi(x) = 0 for |x| < l. I don't know what to do, and the book I'm using isn't the least bit enlightening.

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# Partial Differential Equations

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