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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
May
17
revised A silly problem on critical points?
added 330 characters in body
May
17
revised Barbeau's Polynomials: Quadratic Polynomials, 1.2.2
edited tags
May
17
revised Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots?
edited tags
May
14
revised If $n^2=ab$ and $\gcd(a,b)=1$, show that $a,b$ are not necessarily squares.
edited body
May
6
revised Why the $GCD$ of any two consecutive fibonnaci numbers is $1$?
added 433 characters in body; edited tags
Apr
15
revised About the differentiability of $|x|$?
added 4 characters in body
Apr
1
revised Are there two meanings to induction?
added 3 characters in body
Mar
21
revised Suplement books for calculus course?
added 352 characters in body
Mar
20
revised Suplement books for calculus course?
added 131 characters in body
Mar
16
revised Suplement books for calculus course?
added 74 characters in body
Feb
23
revised How to solve this distribution problem with generating functions?
added 4 characters in body
Jan
24
revised Confusion about Hajós construction?
added 63 characters in body
Jan
6
revised Differentiating $1/(1-x)$ using the fact that $[x^n]'=nx^{n-1}$?
added 2 characters in body
Jan
5
revised Why the generating function of $\frac{2^K}{k!}$ is $e^{2x}$ instead of $e^{2^{x}}$?
added 168 characters in body
Jan
2
revised Is there only one continuous-everywhere non-differentiable funtion?
added 207 characters in body
Dec
26
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
Dec
19
revised How to solve this kind of problem?
added 174 characters in body; edited tags
Dec
17
revised Does $\frac{0}{0}$ really equal $1$?
added 128 characters in body