## I am testing the features of this blogger format. We'll see if I actually end up using it.

This is also a test. Perhaps you'd like to email me.
Draper and von Braun doing rocket stuff. Probably for flight.
The image sizing features are not great.

Let's look at some latex!!!
\begin{align} & x_{t+1} = A_t x_t + B_t u_t + w_t \\ & y_t = C_t x_t + D_t u_t + v_t \label{eq3} \end{align}

hmmm
${{\displaystyle J(\mathbf{x},\mathbf{u})=\mathbb {E} \left[{\mathbf {x} }_{N}^{\mathrm {T} }Q_T{\mathbf {x} }_{N}+\sum _{i=0}^{N-1}(\mathbf {x} _{i}^{\mathrm {T} }Q_{i}\mathbf {x} _{i}+\mathbf {u} _{i}^{\mathrm {T} }R_{i}\mathbf {u} _{i})\right]}}$

okay some things are definitely tricky.