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 22h revised What is the determinant of the sum of a diagonal matrix and a matrix of ones? Get rid of a pesky typo Mar23 revised What is the lower bound for an algorithm that reconstructs a permutation? fix typos Mar13 revised How to prove that $\lim\limits_{x\to0}\frac{\sin x}x=1$? formatting. Mar3 revised Is there a totally ordered set we can map any other totally ordered set to? added 2 characters in body Nov27 revised Showing that $\lim_{x\to\infty}\left(\sqrt{x^2+c}-x\right)=0$ add condition on c Jun12 revised Ice Cream Combinatorics Formatting Oct16 revised How can I find a point where an osculating circle goes through a certain point? added 17 characters in body Sep8 revised The inverse of the inscribed angle theorem added 44 characters in body Sep8 revised The inverse of the inscribed angle theorem deleted 11 characters in body Apr6 revised High school math definition of a variable: the first step from the concrete into the abstract… typographic improvements Mar30 revised What is the expression of $n$ that equals to $\sum_{i=1}^n \frac{1}{i^2}$? Make links linky Jan17 revised Question about a lemma on continuity added 8 characters in body Dec18 revised Find function if known some limit Formatting Oct23 revised How do I prove $f (n) = \omega(2^n)$ if $f(n) = n!$? add latex. w -> \omega?!? Oct12 revised Probability of a random $n \times n$ matrix over $\mathbb F_2$ being nonsingular added 119 characters in body; edited tags Sep21 revised Easy proof, that $\rm e\notin \mathbb Q$ deleted 5 characters in body Sep6 revised Help with easy proof Add latex syntax. Sep4 revised Project Euler, Problem #25 Consistent notation: \phi -> \varphi Aug29 revised Conjectures that have been disproved with extremely large counterexamples? Add syntax. Jul14 revised $\sqrt[x]{y} = y^{1 / x}$? Need help with algebra of exponentiation Really show the second line (as intended)