Discrete mathematics

Book of proof

The Book of Proof by Richard Hammack is one of the recommended readings for Part IA discrete mathematics. This version is freely available online, and has been approved by the American Institute of Mathematics Open Textbook Initiative.

Fractional graph theory

The full text of this book by Edward R. Scheinerman and Daniel H. Ullman, is available online in PDF format. The printed copy is available to borrow in the library.