Jacobian of a Lorentz transformation

[whatisreality]

Homework Statement

I've never encountered Jacobians before, and having read up on them a bit I find the wording of the last part of this question confusing:

A set of coordinates $x'_{\mu}$ in frame B is obtained from the set $x_{\mu}$ in frame A, by boosting B w.r.t A with speed beta along the $x_3=z$ axis. Write down the Jacobian that let's you write $\frac{\partial}{\partial x'_{\mu}}$ in terms of $\frac{\partial}{\partial x_{\mu}}$

Homework Equations

The Attempt at a Solution

I'm not really sure what I'm being asked! It sounds to me a bit like I should just write down the Jacobian, but isn't that equal to 1? That's what it looks like to me based on this:
http://farside.ph.utexas.edu/teaching/em/lectures/node114.html

Thanks for any help. :)

 

[vela]

The problem is asking for the Jacobian matrix. Both the matrix and its determinant are often referred to as the Jacobian.