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1d
accepted What's the necessary condition for that any three vectors are parallel to the edges of a triangle in the plane?
1d
accepted $1+2+3=\int_{0}^{\infty}t^3e^{-t} dt$?
1d
accepted Why the Ramsey number $R(2,4)$ is not equal to $2$?
Aug
31
accepted Is non-paralellism transitive?
Jul
21
accepted Minor mistake computing $\int \frac{1}{x^3+2x^2-3x} \; dx$?
Jul
17
accepted Why $\frac{1}{9}$ becomes $\frac{1}{3}$ in $\frac{1}{3} \int \frac{1}{s^2+1} \, ds$?
Jul
7
accepted When should I shift $a$ and $b$ in $\cfrac{x^2}{a^2}+\cfrac{y^2}{b^2}=1$?
Jul
7
accepted Where are these choices of $A',B',C'$ for this quadratic form?
Jul
1
accepted Why $\int_c^{x+h}f(t) dt-\int_c^x f(t) dt = A(x+h)-A(x)$?
Jun
28
accepted A $X \subseteq \mathbb{A}^n$ such that $I(X) \neq I(V(I(X)))$?
Jun
20
accepted Confusion in the proof of the derivative of $u(x)/v(x)?$
Jun
19
accepted Why the distance from the point to the line is $\frac{|(P-Q)\cdot N|}{\|N\|}$?
Jun
13
accepted Why $u(x+ \Delta x)\cdot v(x+ \Delta x)=(u+\Delta u)(v+\Delta v)$?
Jun
7
accepted Verifying if these basis are positive or negative?
Jun
7
accepted Find the line segments cut off by the plane $ax+by+cz+d=0$ on the coordinate axes, if $abcd\neq 0$
Jun
6
accepted What are the dimensions of the region that minimizes the quantity of fence?
May
30
accepted What is wrong with my solution to this problem?
May
25
accepted Why having $ma+np=1$ implies that $m$ is the inverse?
May
23
accepted The angle between $u$ and $v$ is $30º$, and the vector $w$ of norm $4$ is ortogonal to both $u,v$. Calculate $[u,v,w]$.
May
17
accepted Having the roots of a polynomial, is it possible to go back and find a polynomial that have exactly these roots?