nodakai
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 Feb 26 awarded Supporter Feb 25 comment What is $f(2)$ if $f'(x) = \sin\left(\frac{\pi}{2}e^x\right)$ and $f(0) = 1$? @GEdgar: Oops, "*" disappeared somewhere while I copy&pasted the URL... This is a corrected version Feb 25 comment Do I use Euler -method with Differentials correctly? You need to explain what is "the same book as earlier", what you meant by h, $y_0$ and $y_1$, where k has gone, how you came up with "recursion" (instead of iteration), ... lots of things Feb 25 comment What is $f(2)$ if $f'(x) = \sin\left(\frac{\pi}{2}e^x\right)$ and $f(0) = 1$? Hi @GEdgar, you're a professional mathematician, right? Unfortunately your argument seems a bit too succint for me... Could you elaborate on that please? Eg. "total length < 1" is not clear to me at all... I believe it's something like "since $(e^x)'$ is strictly positive, ..." Moreover I don't see why 0.157 is too close to zero. BTW, here is f'(x) plotted by Google Feb 25 answered Proof of $\displaystyle\sum_{0 \le k \le a} {a \choose k} {b \choose k} = {a+b \choose a}$ Feb 23 awarded Teacher Feb 23 revised Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$ added 115 characters in body Feb 23 awarded Editor Feb 23 revised Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$ added 137 characters in body Feb 23 answered Finding domain of $\sqrt{ \frac{(x^2-1)(x^2-3)(x^2-5)}{(x^2-2)(x^2-4)(x^2-6)} }$ Feb 20 comment Regular Expressions - Over the alphabet $(a, b, c)$ Just a quick note: are you aware of cstheory.stackexchange.com dedicated to CS? Feb 5 awarded Autobiographer