calculate the ACF of $y_{t}=x_{t}x_{t-1}$
31133
Functions of Independent Random Variables
25205
How to calculate the transfer function?
88137
$y''-2y'+y=te^t$ by method of undetermined coefficients
55680
The relationship of ${\frak m+m=m}$ to AC
9587
If $f(t) = 1+ \frac{1}{2} +\frac{1}{3}+....+\frac{1}{t}$, find $\sum^n_{r=1} (2r+1)f(r)$ in terms of $f(n)$
114844
Global maxima/minima of $f(x,y,z) = x+y+z$ in $A$
20568
Does the following have a solution for f(x,y)?
81380
How fast does the sequence $y_t$ defined by $y_{t+1}=y_t(1-y_t)$ decay to zero?
69172
$y'=$ ${-x+\sqrt{(x^2+4y)}}\over 2$ , $y(2)=-1$
149355
find $\left( \frac{x}{x+y} \right)^{2007} + \left( \frac{y}{x+y} \right)^{2007}$
143765
To Show that $\exp(tX)\exp(tY)= \exp(t(X+Y)) + (1/2)t^2[X, Y] +o(t^3)$
378
Does $\hat{\beta}=(X′X)^{−1}X′ \ Y$ simplify further?
115513
Find the minimum of $\sqrt{(x+1)^2+(y-1)^2}+\sqrt{(x+2)^2+(y+2)^2}+\sqrt{(x-1)^2+(y+1)^2}$ For real $x,y$
19139
$T:\ell_2\to \ell_2, T(x_1,x_2,\dotsc)=(x_1,x_2/2,x_3/3,\dotsc)$
18282
Finding the minimal polynomial, the eigenvalues, and the characteristic polynomial of $T(A)=A+A^t$
3092
Find where $r(t)=$ hits the $x-y$ plane
52681
Formula for an ARIMA(1,1,1) solving for y