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 Apr 19 comment Can I take ln(y) in sequences/series? The statement after your first arrow doesn't follow from the previous statements.... Dec 7 comment Explicit formula for quadratic recurrence This may be of interest: mathworld.wolfram.com/QuadraticMap.html. Nov 11 revised Let $(G, *)$ be a group and let $\{g,h\}$ be a subset of $G$. Prove that $(g*h)^{-1}=h^{-1}*g^{-1 }$. Improved formatting Nov 11 suggested approved edit on Let $(G, *)$ be a group and let $\{g,h\}$ be a subset of $G$. Prove that $(g*h)^{-1}=h^{-1}*g^{-1 }$. Oct 7 comment Prove with Euclid's Algortihm @KFC Note that the last nonzero remainder is 1, implying that $\gcd(mk-1, m)=1$. Oct 7 answered Prove with Euclid's Algortihm Oct 7 answered Value of acceleration vector at maximum speed. Oct 7 revised Why $\cos(4\cos^{-1}(\frac{x}{2})) = \frac{x^4}{2} -2x^2+1$ $?$ Added detail. Oct 7 answered Why $\cos(4\cos^{-1}(\frac{x}{2})) = \frac{x^4}{2} -2x^2+1$ $?$ Oct 7 comment Find a basis for a solution set of a linear system @user124384 I'm not sure in what sense you are using the term 'equivalent,' but, in general, one can scale the elements of any basis by any nonzero scalar to obtain a different basis. Oct 2 awarded Yearling Aug 7 comment $\alpha''(t)=0$ what can we say about $\alpha$ The curve $\alpha$ will be a line. Feb 17 revised How do I integrate an expression of the form $(x + c)^n dx$? Improved formatting. Feb 17 suggested approved edit on How do I integrate an expression of the form $(x + c)^n dx$? Feb 17 comment How do I integrate an expression of the form $(x + c)^n dx$? Do a $u$-substitution for $x+100$. Dec 20 comment Subspaces of vector space and their spans Ah, ok. Then, by the definition of subspace, the span of a subspace is just that subspace. Dec 17 revised Connectedness proof Corrected spelling Dec 17 suggested approved edit on Connectedness proof Dec 17 awarded Caucus Dec 10 awarded Popular Question