The 4th edition of Discrete Mathematics: an Open Introduction is now available and features a new organization of content with a focus on logic, proofs, graph theory, counting, and sequences. The book offers a stronger emphasis on discrete structures, making it ideal for students in computer science and math majors. There are more interactive exercises and code examples in Sage and Python to enhance learning. The online version is free forever, with a PDF coming soon and a print edition available next year. The book is released under a Creative Commons License with new NC-Non Commercial addition.
https://discrete.openmathbooks.org/dmoi4.html