Discrete mathematics is mathematics that deal with discrete objects, meaning "separated" from each other. Integers, rational numbers, automobiles, people etc. are all discrete objects. On the other hand real numbers are not discrete. As you know between any two different real numbers there is another real number different from either of them. So they are packed without any gaps and can not be separated from their immediate neighbors. In that sense they are not discrete. In this course we will be concerned with objects such as integers, propositions, sets, relations and functions, which are all discrete. We are going to learn concepts associated with them, their properties, and relationships among them among others.