The difference between the sixth edition of Discrete Mathematics and its Application and the original edition is: \ x0d \ x0d \ Discrete Mathematics and its Application (the sixth edition of the original edition. Undergraduate Teaching Edition) is adapted from the sixth edition of this book, which retains the basic contents involved in domestic discrete mathematics courses, and is more suitable as the teaching material of discrete mathematics courses for undergraduates majoring in computer and related majors in domestic universities. The specific adaptation of this book is as follows: x0d supplements the basic content about paradigms and standards. \x0d\ Deleted the contents of number theory, discrete probability, induction, recursion and other courses. \x0d\ For reserved chapters, even numbered exercises are deleted. \x0d\ deleted relevant historical data. \ x0d \ x0d \ Discrete Mathematics and its application is a classic textbook introducing the theory and methods of discrete mathematics, and it has become the most widely used discrete mathematics textbook. More than 600 colleges and universities in the United States alone use it as a textbook and have achieved great success. The sixth edition has made many improvements on the basis of the first five editions and has become a more effective teaching tool.