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 Feb 20 accepted Is there a reasonable generalization of the falling factorial for real exponents? Feb 20 asked Is there a reasonable generalization of the falling factorial for real exponents? Feb 16 comment $y''=(y')^{3} e^{y}$, some easy way to solve this non-linear differential equation? Did you tried using Wolfram Alpha? It can also shows you a step-by-step solution. Jan 17 accepted Question about a lemma on continuity Jan 17 comment Question about a lemma on continuity @Arturo Sorry. That was a translation mistake. In German, one says "stetig" to say "continuous". stetig and steady are false friends... Jan 17 revised Question about a lemma on continuity added 8 characters in body Jan 17 asked Question about a lemma on continuity Jan 8 comment Given the cartesian coordinates of four points, how to calculate the interection of two lines they form? @J.M. Oh yeah. That looks good. THank you! BTW, is there a solution that use the $r,\vartheta$ representation instead? Jan 8 comment Given the cartesian coordinates of four points, how to calculate the interection of two lines they form? @J.M. Of course. This possibility is ruled out. Jan 8 asked Given the cartesian coordinates of four points, how to calculate the interection of two lines they form? Jan 1 awarded Yearling Dec 18 revised Find function if known some limit Formatting Dec 18 suggested approved edit on Find function if known some limit Dec 8 awarded Nice Question Dec 2 comment Defining division by zero @picakhu You are going to run into problems when calculating limits. Just consider $\lim_{n\to0}\frac{2n}n$. Using your method, one gets $\frac{\infty_0}{\infty_0}=1$, while one gets $\frac21=2$ using the definition of limits. Nov 22 accepted Complexity of sorting algorthms Nov 22 asked Complexity of sorting algorthms Nov 22 answered Solve $f(f(n))=n!$ Nov 13 comment How to convert $\sqrt{\frac{5}{3}}$ to $\frac{\sqrt{15}}{3}$? @Max ${5\over3}\to{15\over9}$ Nov 13 comment How to convert $\sqrt{\frac{5}{3}}$ to $\frac{\sqrt{15}}{3}$? BTw, you can use LaTeX makeup by starting with an \$and ending with another \$, for instance $\sqrt{\frac{5}{3}}$ becomes $\sqrt{\frac{5}{3}}$.