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 Title Discrete Mathematics: An Open Introduction
 Author(s) Oscar Levin
 Publisher: CreateSpace (December 31, 2018); eBook (3rd Edition, 12/29/2019)
 License(s): CC BYSA 4.0
 Paperback 407 pages
 eBook HTML and PDF (412 pages)
 Language: English
 ASIN: 1792901690
 ISBN13: 9781792901690
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Book Description
This third edition brings improved exposition, a new section on trees, and a bunch of new and improved exercises.
This gentle introduction to discrete mathematics is written for first and second year math majors, especially those who intend to teach. The text began as a set of lecture notes for the discrete mathematics course at the University of Northern Colorado. This course serves both as an introduction to topics in discrete math and as the "introduction to proof" course for math majors. The course is usually taught with a large amount of student inquiry, and this text is written to help facilitate this.
Four main topics are covered: counting, sequences, logic, and graph theory. Along the way proofs are introduced, including proofs by contradiction, proofs by induction, and combinatorial proofs. The book contains over 360 exercises, including 230 with solutions and 130 more involved problems suitable for homework. There are also Investigate! activities throughout the text to support active, inquiry based learning.
While there are many fine discrete math textbooks available, this text has the following advantages:
 It is written to be used in an inquiry rich course.
 It is written to be used in a course for future math teachers.
 It is open source, with low cost print editions and free electronic editions.
 Oscar Levin is an Associate Professor at the University of Northern Colorado in the School of Mathematical Sciences. He has taught mathematics at the college level for over 10 years and has received multiple teaching awards. He received his Ph.D. in mathematics from the University of Connecticut in 2009.