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**Home Assignment 2 / Re: Problem 1 -- not done yet!**

« **on:**October 07, 2012, 11:15:56 AM »

Posted by: Rouhollah Ramezani

C) Contains a logical error in the domain $\{âˆ’2t<x<2t\}$ (`middle sector`) which should be found and fixed. Note that the solution of RR there is not in the form $\phi(x+2t)+\psi(x-2t)$

C) is also amended, but I probably failed to spot the "logical error" and it is still there.

You presume that $u$ should be continuous, which is not the case. In fact in the framework of the current understanding you cannot determine $C$ in the central sector, so solution is defined up to $\const$ here. One needs to dig dipper in the notion of the weak solution.

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PS MathJax is not a complete LaTeX and does not intend to be, so it commands like \bf do not work outside of math snippets (note \bf); MathJax has no idea about \newline as it is for text, not math. For formatting text use either html syntax (in plain html) or forum markup

Yes, I realized that after. And I found out from your other post that we can actually use an html editor+MathJax instead of LaTeX. right?

Not really: you do not use html syntax but a special SMF markdown which translates into html (so you cannot insert a raw html-- but Admin can if needed.