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 17h revised The angle between $u$ and $v$ is $30º$, and the vector $w$ of norm $4$ is ortogonal to both $u,v$. Calculate $[u,v,w]$. added 17 characters in body 1d revised Suplement books for calculus course? added 124 characters in body May17 revised A silly problem on critical points? added 330 characters in body May17 revised Barbeau's Polynomials: Quadratic Polynomials, 1.2.2 edited tags May17 revised Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots? edited tags May14 revised If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares. edited body May6 revised Why the $GCD$ of any two consecutive fibonnaci numbers is $1$? added 433 characters in body; edited tags Apr15 revised About the differentiability of $|x|$? added 4 characters in body Apr1 revised Are there two meanings to induction? added 3 characters in body Mar21 revised Suplement books for calculus course? added 352 characters in body Mar20 revised Suplement books for calculus course? added 131 characters in body Mar16 revised Suplement books for calculus course? added 74 characters in body Feb23 revised How to solve this distribution problem with generating functions? added 4 characters in body Jan24 revised Confusion about Hajós construction? added 63 characters in body Jan6 revised Differentiating $1/(1-x)$ using the fact that $[x^n]'=nx^{n-1}$? added 2 characters in body Jan5 revised Why the generating function of $\frac{2^K}{k!}$ is $e^{2x}$ instead of $e^{2^{x}}$? added 168 characters in body Jan2 revised Is there only one continuous-everywhere non-differentiable funtion? added 207 characters in body Dec26 revised What is the generating function to calculate the number of functions $f:\{1,2,3,4,5,6,7,8,9,10\}\to\{1,2,3,4,5,6,7\}$ with $|Im(f)|=4$? added 14 characters in body Dec19 revised How to solve this kind of problem? added 174 characters in body; edited tags Dec17 revised Does $\frac{0}{0}$ really equal $1$? added 128 characters in body