In Equation 7.2, dot is over the subscript
From FBSwiki
		
		
		
| Edition | Second | 
|---|---|
| Version number | 3.0h | 
| Submission date | 26 Oct 2016 | 
| Your name | Kai Kirk | 
| E-mail address | mailto:kkirk@caltech.edu | 
| Chapter | 7 | 
| Page number | 7-3 | 
| Line number | 14 | 
| Current status | Rejected | 
x_d dot = d/dt (x_d) --> the x_d is dotted over the d not the x. should be dotted over the x or the entire x_d?
Response: the equation is correct as written. Exercise 6.1 states that the response to the derivative of a signal is the derivative of the response, and the first equality is making use of this fact.

