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Jan
12
accepted What's the importance of conics and quadrics in the context of a course of pure mathematics?
Nov
22
accepted How did he went from $b_{12}$ to $\tan 2\varphi=\cfrac{2a_{12}}{a_{11}-a_{22}}$?
Nov
19
accepted What is the meaning of primes here?
Nov
5
accepted Find the points on the ellipse $x^2+2y^2=1$ where the tangent line has slope $1$.
Oct
12
accepted Is my proof of $-(-a)=a$ correct?
Sep
8
accepted Prove that the biscetors of adjacent suplementary angles are perpendicular?
Sep
3
accepted What's the necessary condition for that any three vectors are parallel to the edges of a triangle in the plane?
Sep
3
accepted $1+2+3=\int_{0}^{\infty}t^3e^{-t} dt$?
Sep
3
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?