After Example 3.4, difference equation should be difference equations
From FBSwiki
		
		
		
| Edition | Second | 
|---|---|
| Version number | 3.0h | 
| Submission date | 4 Oct 2016 | 
| Your name | Chanud Yasanayake | 
| E-mail address | cyasanay@caltech.edu | 
| Chapter | 3 | 
| Page number | 3-17 | 
| Line number | -2 | 
| Current status | Closed | 
At the bottom of the page it says "Another application of difference equation...". It should be "equations".

