Ben Alpert
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 Apr 27 revised When is a recurrence relation linear edited tags Apr 27 revised There is a table of the complexity of recursive algoritms? edited tags Apr 26 comment Calculating the highest possible damage achievable using 6 items from a pool of ~25 Probably belongs on SO. Apr 25 comment Inclusion-exclusion principle: Number of integer solutions to equations @DAK: Reread Gerry's last paragraph. For the intersection of $A_1$ and $A_2$, it's equivalent to solving $v_1+v_2+y_3+y_4=5$ with $v_1, v_2, y_3, y_4 \ge 0$. Just like the number of solutions to solve $y_1+y_2+y_3+y_4 = 12$ is $C(15,3)$, the number of solutions to that equation (and the size of the $\lvert A_1 \cap A_2 \rvert$ set) is $C(8,3)$. Apr 25 comment Inclusion-exclusion principle: Number of integer solutions to equations I agree, I think it's $C(12 + 4 - 1, 3) = C(15,3)$. Apr 16 awarded Nice Question Apr 13 comment Can (x'y' + xy) be simplified? @Brandon: You should probably write that as an answer. Apr 13 comment Draw customized (calculus) graphs like these? Not sure whether to flag it, but I have enough rep to retag stuff so I got rid of the graph-theory tag. Apr 13 revised Draw customized (calculus) graphs like these? edited tags Apr 12 suggested rejected edit on Probability of having at least 'k' marbles specific to each of 'm' bags filled by sampling with replacement Mar 31 comment Interpreting “lying on the parabolas” Out of curiosity, how do you get Mathematica to make that? Mar 27 revised On deriving the arclength of a hyperbola Just formatting. Mar 27 suggested approved edit on On deriving the arclength of a hyperbola Mar 20 comment Numbers satisfying $\binom{n}{k} = m!$ I just wrote a script and I don't believe there are any others up to 13! (except of course $\binom{n}{0}$ and $\binom{n}{1}$). Mar 20 revised expected area of a triangle determined by randomly placed points fix formatting again Mar 20 suggested approved edit on expected area of a triangle determined by randomly placed points Mar 20 revised expected area of a triangle determined by randomly placed points fixed formatting Mar 20 suggested approved edit on expected area of a triangle determined by randomly placed points Mar 20 revised Non-Standard Deviation absolute value instead of diff() Mar 20 awarded Organizer