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 Feb6 comment Simple factorials I'm not an expert on this so I will post this as a comment: Have you tried the Stirling Approximation? It might not give you the correct value but it is usefull to do calculations with factorials such as large binomial coefficients. Feb6 comment Differential Equation - Blood Alcohol Are you sure? At $t=0$ your solution is $0$! So the person is sober. :-) Jan26 accepted Equality Constraints in Quadratic Programming Jan23 comment Equality Constraints in Quadratic Programming @MichaelGrant Well, you are probably right. The fact is, I want to explore SOCP in more detail and I am looking for open source software projects (non-commercial) on this topic. Even worse, I want to understand the methods used at least concept-wise. If you could point me to the algorithms actually used in practice (from your profile page I am quite sure you know all about them) I would be more than happy to look at them instead! Unfortunately, all R packages with SOCP solvers use this exact 1995 code! Jan23 asked Equality Constraints in Quadratic Programming Jul13 awarded Yearling Feb5 comment Is it faster to count to the infinite going one by one or two by two? @PaĆ­loEbermann Agreed, of course its all about the numbering of the sequence. We didn't properly define "slow". If we say "slow" means that it takes a longer time to spell the first $N$ members of the sequence then counting by two is slower, at least in binary it is. This is not a statement about the usual "slow" in mathematics: convergence speed. Feb5 awarded Nice Answer Feb4 revised Is it faster to count to the infinite going one by one or two by two? edited body Feb4 revised Is it faster to count to the infinite going one by one or two by two? added 861 characters in body Feb3 answered Is it faster to count to the infinite going one by one or two by two? Sep24 comment Find $\mathbb E[(X+1)^2]$ It's $3\int_0^{\sqrt{3}-1}\frac{1}{1+x}dx = 3(\ln{(1+x)}\vert_{0}^{\sqrt{3}-1}) = 3\ln{\sqrt{3}}$ Sep24 revised Help show/prove linear transformation fancier latex Sep24 suggested approved edit on Help show/prove linear transformation Sep13 comment Show basin of attraction has only one connected component You didn't use the polynomial of degree 2 yet... If you look at $f^\prime(z)$, how many critical points are there? Can a critical point lie both in $U$ and $V$? Jul13 awarded Yearling May15 comment Prove that if a set $E$ is closed iff it's complement $E^{c}$ is open @Dominic Michaelis Of course. Like you and Mariano Suarez-Alvarez said the definition is important. So user77107 simply proved a different characterization of closed. May15 revised Questions on Green's Theorem some spelling and latex fixed May15 suggested approved edit on Questions on Green's Theorem May15 revised Why is this function continuous on $x \in \mathbb{R}$ where $x < 1$? fixed typo in question