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 Feb 13 comment Step by step for solving $\sum^n_{i=1}{(a+b)^i}$? ¿Have you tried to prove it by induction? Feb 13 answered Why this “interpolation” is correct? Feb 13 answered True or false - Function analytic in bounded domain is bounded. Feb 13 revised non linear optimization No need for caps in title. Feb 13 suggested approved edit on non linear optimization Feb 12 comment Identifying Proof Method and Implementing It What you mention should work perfectly. As for the name of the method, I don't know, but I've seen that sometimes be called prove by inspection. Which is what you do when you analise all possible cases... Feb 12 comment Group tables for a group of four elements. @user61854 Yes, in my case 1, you have that: $a^2=b^2=c^2=1$, so: $ab=c, bc=a$, it's abelian, so the whole table is there. In my case 2, $a$ is the generator, so $a=a,a^2=b,a^3=c$, and you can compose to get the rest of the combinations. Feb 12 revised Let $A$ be a $3 \times 3$ matrix with real entries such that… deleted 1 characters in body Feb 12 answered Let $A$ be a $3 \times 3$ matrix with real entries such that… Feb 12 comment Finding the $g'$ of 2 functions Except for the line that @GerryMyerson has said, I think they're correct. The difference between these and the expressions for a function that may be used to see, is that here you're getting to a differential equation for $g$, instead of the function itself. Feb 11 comment Group tables for a group of four elements. @amWhy I would have never imagined, Lagrange always comes really soon. I guess that then he will have to do every possible table to get to the same conclusion. Feb 11 answered Group tables for a group of four elements. Feb 11 comment Complex Analysis - confusion over conjugate To get to that polar form you're supposing that $z\not =0$, if $z=0$ then the function is 0/0, so it's not analytical in that point. Feb 11 answered Let $m \in \mathbb{Z^+} , n \in \mathbb{Z^+}$ and let $d=\gcd(m,n)$. Prove that $m\mathbb{Z}+n\mathbb{Z}=d\mathbb{Z}$ Feb 10 comment For each $n \ge 1$ compute $Z(S_n)$ @CrystalSeluini You're welcome, I updated my answer to explain what $Z(G)$ is, as you asked it in a comment. Good luck! Feb 10 revised For each $n \ge 1$ compute $Z(S_n)$ added 469 characters in body Feb 10 answered For each $n \ge 1$ compute $Z(S_n)$ Feb 9 comment Definite Integral question, help! @BrianM.Scott Did I? Total mistake, I'm sorry. I was going to say the integral should be zero because its period is $6\pi$, but if the upper limit is $\pi /6$ then I'm wrong... I'm sorry. Feb 9 awarded Organizer Feb 9 revised Definite Integral question, help! some LaTeX added