Update free-books.md

2016-10-03 08:14:42 -04:00 · 2016-10-03 08:14:42 -04:00 · 63585c3601
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 ### Math (Discrete Math)

+Name | Author(s)
+:-- | :--:
+[Applied Discrete Structures](http://faculty.uml.edu/klevasseur/ads2/) | Alan Doerr, Ken Levasseur
+
 ### Algorithms

 ### Programming Paradigms