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 Jun 13 awarded Popular Question Sep 24 awarded Autobiographer Nov 30 awarded Yearling Aug 5 accepted Which linear map maps $\begin{bmatrix}a_0&a_1&a_2\end{bmatrix}^\top\mapsto \begin{bmatrix}a_0&a_0+a_1&a_0+a_1+a_2\end{bmatrix}^\top$? Aug 5 comment Which linear map maps $\begin{bmatrix}a_0&a_1&a_2\end{bmatrix}^\top\mapsto \begin{bmatrix}a_0&a_0+a_1&a_0+a_1+a_2\end{bmatrix}^\top$? Ah that's how you do it. Very easy, thanks! Aug 5 asked Which linear map maps $\begin{bmatrix}a_0&a_1&a_2\end{bmatrix}^\top\mapsto \begin{bmatrix}a_0&a_0+a_1&a_0+a_1+a_2\end{bmatrix}^\top$? Aug 4 revised Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ added 27 characters in body Aug 4 revised Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ added 2 characters in body Aug 4 accepted Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ Jun 10 revised Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ added 2 characters in body Jun 10 answered Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ Jun 10 comment Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ How did you transform $x_n-{1\over 2}\Bigl(x_n+{2\over x_n}\Bigr)$ into ${1\over 2}{(x_n^2-2)\over x_n}$? Jun 10 asked Prove that $\{x_1=1,\,x_{n+1}=\frac {x_n}2+\frac 1{x_n} \}$ converges when $n \to \infty$ Jun 6 answered Solving a simple ${\cal O}(N\log N)$ recursive equation. Jun 6 revised Solving a simple ${\cal O}(N\log N)$ recursive equation. added 8 characters in body Jun 6 answered Solving a simple ${\cal O}(N\log N)$ recursive equation. Jun 6 revised Solving a simple ${\cal O}(N\log N)$ recursive equation. corrected substitution Jun 5 comment Solving a simple ${\cal O}(N\log N)$ recursive equation. This sum looks good; I remember that my algorithms & data structures professor used a very special trick to prove that this sum does indeed equal ${\cal O}(N\log N)$. Jun 5 asked Solving a simple ${\cal O}(N\log N)$ recursive equation. Jun 5 accepted Quadratic matrices: When is $A^\top B^\top = AB$?