Ray
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 Sep 24 awarded Popular Question Jul 2 awarded Curious Jan 18 revised How would I simplify this? deleted 492 characters in body Jan 18 accepted How would I simplify this? Jan 18 comment How would I simplify this? Thanks for your help, yeah Im doing quite a long question so I just wanted to make sure I did it correctly before proceeding. Jan 18 asked How would I simplify this? Jan 16 revised How do I differentiate this? deleted 173 characters in body Jan 16 comment How do I differentiate this? Thanks, Im sorry but im really stuck on this question. How would I find $\partial^2_x,\partial_x\partial_y,\partial_y\partial_x,\partial_y^2$ etc.? As in, what do I differentiate when I am trying to find $\partial_x^2$? Jan 16 comment How do I differentiate this? Thanks, but what would the $f$ be? $\frac{x+y}{\sqrt 2}$? Jan 16 comment How do I differentiate this? Thanks, I understood what you did, but for $\partial^2u=\frac 12(\partial^2_x+\partial_x\partial y+\partial_y\partial_x+\partial_y^2)$, what exactly do I differentiate? What would $\partial^2_x$ be for example? Jan 16 comment How do I differentiate this? Thanks, Im just wondering, how did you get $x=(u+v)\sqrt{2}$ and $y=(u-v)\sqrt{2}$? Jan 16 comment How do I differentiate this? haha no problem, its ok. Jan 16 comment How do I differentiate this? @Emmad: It doesnt state anything in the problem, although you can take a look at the original question below (note the $v$ changes to $w$ in the original question). math.stackexchange.com/questions/99608/… Jan 16 comment How do I differentiate this? Thanks, so is the answer for both, $0$? Jan 16 asked How do I differentiate this? Jan 16 comment Change of variables of PDE thanks, now i see it! I think you just made a typo though, its $x = \frac{u + w}{\sqrt{2}}$. Jan 16 asked Change of variables of PDE Dec 10 accepted Inequality question (with complex numbers) Dec 10 accepted Contour integration help: $\int_{\gamma}e^zdz$ with $\gamma(\theta)$=$e^{i\theta}$ Dec 10 accepted Estimation lemma question