This is a text that covers the standard topics in a sophomore-level course in discrete mathematics: logic, sets, proof techniques, basic number theory, functions, relations, and elementary combinatorics, with an emphasis on motivation. It explains and clarifies the unwritten conventions in mathematics, and guides the students through a detailed discussion on how a proof is revised from its draft to a final polished form. Hands-on exercises help students understand a concept soon after learning it. The text adopts a spiral approach: many topics are revisited multiple times, sometimes from a different perspective or at a higher level of complexity. The goal is to slowly develop students’ problem-solving and writing skills.
In this edition (the second edition), many errors and misprints have been corrected. Slight revisions are introduced. The major change is the addition of a new chapter on preliminary materials to prepare students for a standard course in Discrete Mathematics. More importantly, the revisions adhere to the spirit of the spiral approach we use in the text. In many proofs, an overview is added at the beginning to pinpoint the assumption and the goal of the proof. This
should help the students in developing the habit of devising a plan before writing up a proof.
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