@ -386,6 +386,8 @@ Original Source: [Free Programming books](http://stackoverflow.com/revisions/392
* [Mathematical Logic - an Introduction ](http://www.ii.uib.no/~michal/und/i227/book/book.pdf ) (PDF)
* [Notes on Differential Equations ](http://www.math.cornell.edu/~bterrell/dn.pdf ) - Robert E. Terrell
* [Number Theory ](http://web.mit.edu/~holden1/www/math/number-theory.pdf ) (PDF)
* [Numerical Methods ](http://www.iitg.ac.in/kartha/CE601-14/CourseSchedule.htm ),2014 - Dr. Suresh A. Kartha, IIT, Guwahati
* [Numerical Methods ](ihttp://www.iitg.ac.in/kartha/CE601/LectureSlides.htm ),2012 - Dr. Suresh A. Karmtha, IIT, Guwahati
* [OpenIntro Statistics ](http://www.openintro.org/stat/textbook.php )
* [Ordinary Differential Equations ](http://en.wikibooks.org/wiki/Ordinary_Differential_Equations )
* [Power Programming with Mathematica ](http://mathematica.stackexchange.com/questions/16485/are-you-interested-in-purchasing-david-wagners-power-programming-with-mathemat/22724 ) - David B. Wagner