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seen Apr 17 at 8:21

Mar
15
comment Distance to an affine hyperplane
"Show that there exists $x\in E$ such that $||x||=1$ and $d(y,H)\ge1$". What is $y$?
Mar
12
awarded  Popular Question
Mar
1
answered The boundary value of gradient of solution
Feb
12
answered Does a line integral depend continiously on the curve?
Feb
11
answered Given position vector of points A, B, find the equation of perpendicular bisector of AB in a vector form.
Feb
11
comment Difference between i and -i
In other words, you are asking whether conjugation is an automorphism of $\mathbb{C}$. The answer is yes.
Feb
11
comment Why does linear dependence require a *finite* linear combination to vanish?
math.stackexchange.com/questions/165684/…
Feb
11
comment Does a line integral depend continiously on the curve?
If you choose arc-length parametrization of the curves, I think their derivatives must converge uniformly too. Since the integral is independent of parametrization, you're done.
Dec
15
awarded  Yearling
Oct
18
comment general solution for a 4th order PDE
I don't know what you mean. Do you have the initial conditions, i.e. $W(x,t=0)?$
Oct
18
comment Does this series converge? Can I use a rearrangemt to prove it doesn't?
@EpicGuy Indeed
Oct
18
comment Does this series converge? Can I use a rearrangemt to prove it doesn't?
$$\begin{align} \frac{2}{3}-\frac{1}{3}&=\frac{1}{3}\\ \frac{2}{4}-\frac{1}{4}&=\frac{1}{4}\\ \frac{2}{5}-\frac{1}{5}&=\frac{1}{5}\\ \end{align}$$
Oct
18
comment general solution for a 4th order PDE
Why would you drop the cross derivative term $d^2w/dxdt$?
Oct
16
answered general solution for a 4th order PDE
Oct
16
suggested suggested edit on general solution for a 4th order PDE
Oct
16
answered are all dynamical systems described by differential equations?
Sep
25
comment Intersection points of two circles.
"Every point on the line $y=x+1$ solve both equations". This statement is false. For example, $x=0,y=1$ solves neither.
Sep
17
answered Show that if $a \mid bc$,then $a \mid \gcd(a,b)\gcd(a,c)$.
Sep
17
comment Does a finite game that cannot be drawn imply a winning strategy exists?
Hint: think of the finite game tree, and try to build a strategy from the leaves, rather than the root.
May
20
revised How to show in a clean way that $z^4 + (x^2 + y^2 - 1)(2x^2 + 3y^2-1) = 0$ is a torus?
added 50 characters in body