S of Discrete Mathematics for engineering. It almost cover all topics which are covered chapter wise. Chapter 1 Set Theory, Relation, Function, Theorem Proving Techniques. 1. Set Theory. 2. Countable and uncountable sets. 3. Venn Diagrams. 4. Proofs of some general identities on sets Relation in Venn Diagrams. 5. Types of relation. 6. Composition of relations.