The 4th edition of 'Discrete Mathematics: an Open Introduction' is now available and features significant improvements, including a new content organization starting with logic and proofs, followed by graph theory, counting, and sequences. The edition emphasizes discrete structures, making it more useful for computer science students, while maintaining core mathematical concepts for math majors and future teachers. It includes more interactive exercises and code explorations using Sage and Python. The book is freely available online and under a Creative Commons License.
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