simonthumper
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# 10 Comments

 Apr23 comment Solving a problem to do with the partial derivative chain rule. Ahhhhhhh I'm being stupid don't worry... It's neither is it? $f'(x-y) = \frac{\partial f(x-y)}{\partial s}$ ? Apr23 comment Solving a problem to do with the partial derivative chain rule. Because those are different things so when I do $\frac{\partial^2u}{\partial x \partial y} u$ how do I notate that? Apr23 comment Solving a problem to do with the partial derivative chain rule. The only problem I have still is with your $'$ notation? What does that mean? is $f'(x-y) = \frac{ \partial f(x-y)}{\partial y}$ or $\frac{ \partial f(x-y)}{\partial x}$? Apr23 comment Solving a problem to do with the partial derivative chain rule. Ahhhhh right I've got you! Didn't quite click in my mind what you meant until you showed $\frac{\partial}{\partial y}$ Thanks, I'll have another go at it, then mark you correct :D Apr23 comment Solving a problem to do with the partial derivative chain rule. How do you find $\frac{\partial}{\partial y} u$ Using that method? or $\frac{\partial^2}{\partial x \partial y} u$ ? Apr13 comment Proving formulae for Consecutive population decays. Ok I've followed your method, however even the way your saying to do it doesn't account for the $\alpha A_0 \frac{e^{−\alpha t}−e^{−\beta t}}{\beta − \alpha}$ because you don't get the $e^{-\beta t}$ in the numerator... :/ Apr12 comment Proving formulae for Consecutive population decays. Oooop, just realised I'm being stupid... One second! Apr12 comment Proving formulae for Consecutive population decays. This is confusing me soooo much! I've only ever done particular solutions and general solutions for second order DE's, for first order I've only ever done using integrating factors, but that doesn't work in this case because you don't know what B is, so you can't use it as an integrating factor! :/ Graghhh I'm soooo frustrated with this question :/ Apr12 comment Proving formulae for Consecutive population decays. Will I need to use an integrating factor to get the particular solution? Mar30 comment Evaluation of $\lim_{ x \to \infty} x^{\frac{3}{2}}(\sqrt{x+2}-2\sqrt{x+1}+\sqrt{x})$ Ahhh dammit why can't I spot these things for myself! :P